Kodomonokuni, Family theme park in Yokohama, Japan.

Kodomonokuni is a children's welfare facility spanning about 100 hectares of the Tama Hills in Aoba Ward, Yokohama, and Machida, Tokyo. It has no Ferris wheel or roller coaster; instead there are a farm with dairy cows, Swan Lake with rental boats and rafts, a solar-powered mini steam locomotive, and a red trailer bus called Aka-poppo. Ten former ammunition-store structures remain, reused for park facilities.

The park opened on May 5, 1965, a date celebrated as Children's Day in Japan. The opening marked a commemoration of the marriage of Prince Akihito and Princess Michiko, and some of the wedding gift funds were used to establish the facility.

The name translates as Children's Country and reflects the Japanese approach to creating public spaces where families spend time together outdoors. On weekends and holidays, you often see multiple generations gathering for picnics or taking part in workshops designed for young visitors.

The park is reached via the Tokyu Kodomonokuni Line, which ends at Kodomonokuni Station, changing at Nagatsuta Station on the JR Yokohama Line or Tokyu Den-en-toshi Line. The Odakyu bus stop "Kodomonokuni" sits at the front gate; the only route the official site lists is the [Tsurukawa 07] from Tsurukawa Station to Narakita Danchi. On weekends the official site recommends the rail line because car parks and surrounding roads are congested.

The park keeps ten of the roughly 33 ammunition storehouses confirmed on the site; most were buried before opening, and the surviving structures now serve as park facilities such as electrical installations. Their interiors are normally closed, but they are opened to the public for events like the park's anniversary. Near the entrance gate stands a "Monument of Peace" erected by students of Kanagawa High School for Girls.