Hamamatsu-shi

In the most recent Population Census the population is about 791,000 (790,718 in 2020). Over the five years from 797,980 in 2015 it lost some seven thousand. It is a designated city whose scale, having neared 800,000, is gently turning to decline.

The number of children moves in the same direction. Those under 15 fell from 107,411 (2015) to 101,461 (2020), some six thousand fewer. Over the same period the share aged 65 and over rose from 26.1% to 27.9%. Households with children, however, make up 22.6% (2020), higher than the 19.3% of Shizuoka, seen earlier. Even between the same prefecture’s two designated cities, the center of gravity of household composition differs. The residential land price is around 37,000 yen per m² (37,400 yen/m² in 2026), far below Shizuoka’s 99,000 yen. The Fiscal Capacity Index is 0.81 (2023), a structure in which part of standard expenditure is filled through the local allocation tax. The childcare waitlist is 0 (2025). What is worth seeing here is that these are averages for the city as a whole. Hamamatsu is divided into three wards — Chuo, Hamana and Tenryu — and from the southern built-up area to the northern mountains, the living sphere of the same resident differs greatly. The gaps between wards are flattened out and do not appear in this single figure. Why the city takes this shape cannot be read without going back to the origins of the castle town, textiles and manufacturing.

Hamamatsu’s skeleton lies in a lineage in which a single skill has been handed on while changing fields. It was originally the castle town of Hamamatsu Castle, where Ieyasu spent his twenties through his forties, and which was later called the “castle of success.” But what gives present-day Hamamatsu its character is less the castle itself than the strata of industry stacked on that ground.

The first stratum was textiles. The Enshu region of the Edo period was known as a producer of cotton, and in the Meiji era spinning mills arose and the development of looms advanced. In making looms of complex mechanism, the skills of researching, developing and machining machinery accumulated in the region, and Hamamatsu became a leading textile-industry city. In the terms of economic geography, it is a process in which a single industry concentrates skill and people in a region.

The second stratum, stacked on that base of skill, was motorcycles. Soon after the war, Suzuki Loom Works (later Suzuki), which had made looms; Nippon Gakki (later Yamaha), which had made musical instruments; and the Honda Technical Research Institute (Honda’s founding period) launched into motorcycle production in succession. The machining skill cultivated in looms was transferred straight to the manufacture of engines and motorcycles. At its peak, some forty makers are said to have stood up on this ground. The skill stored up in textiles was handed, intact, to the next industry — this is the backbone of this city’s industry.

In April 2007 Hamamatsu became a designated city. Seven wards were placed at first, realigned into three — Chuo, Hamana and Tenryu — in 2024. Textiles took root in the castle town, that skill was handed on to motorcycles, and the designated city’s area holds the vast land between the Tenryu River and Lake Hamana — Hamamatsu’s form stands on strata of industry layered many times over.

What characterizes Hamamatsu is that, even as both the total population and the number of children decline, the share of households with children, at 22.6%, is thicker than the 19.3% of Shizuoka in the same prefecture. The total fell by seven thousand and the children by six thousand, both turning to decline. Yet in household composition, the ratio of households with children still holds at a high level. It can be read that an origin in which a concentration of manufacturing supported employment, and workers and their families came to live there, still remains in the household center of gravity.

The childcare waitlist is 0 (2025). While the absolute number of children declines, the ratio of households with children is high — and within that, supply and demand have been balanced, pressing the waitlist to zero. In a phase where the total number of children thins, households with children are still thick, and the childcare waitlist is zero, several flows run at once. But this too is an average across three wards; between the southern built-up area and the mountain valley of northern Tenryu, the circumstances of children and childcare cannot be the same. That the residential land price is near a third of Shizuoka’s is also an average flattening a vast municipal area from mountains to sea into one. A figure, on its own, does not fix its own meaning.

Hamamatsu holds many functions of its own. One is the concentration of manufacturing handed on from textiles to motorcycles, musical instruments and transport equipment, where industries tracing the lineage of Suzuki Loom Works, Nippon Gakki and the Honda Technical Research Institute have struck root on this ground. Another is the built-up area of Chuo ward, centered on Ieyasu’s Hamamatsu Castle, where the administrative and commercial center of western Shizuoka sits. The municipal area, moreover, pinched between the Tenryu River and Lake Hamana, holds everything from the southern built-up area to the mountains of northern Tenryu ward within one city.

Hamamatsu became a designated city in 2007, holding prefecture-level administrative authority on its own. From a castle town to a textile-industry city, and on to a concentration of motorcycles and manufacturing — the condition that “machining skill accumulated on this ground” has carried different industries in each era. Looms, motorcycles, musical instruments and transport equipment all rest, in the end, on the same lineage of skill cultivated in textiles. The machining skill stored up to weave on looms gave rise to motorcycles, gave rise to musical instruments, summoned transport equipment. Precisely because the same lineage of skill continued even as the field changed, the families of workers keep living in this city amid a shrinking population.