アマチュア野球の抱える課題に関する研究 ―現役プロ野球選手に対するアンケートをもとに―† 桑 田 真 澄* 川 名 光太郎* 間仁田 康 祐* 平 田 竹 男* A Study on the Problems of Amateur Baseball, Based on a Survey of Active Professional Baseball Players† Masumi KUWATA* , Kotaro KAWANA* , Yasuhiro MANITA* and Takeo HIRATA* Abstract The purpose of this study was to reveal how professional baseball players were trained while they were amate