Gear shift operation mechanism

Provided is a gear shift operation mechanism that makes it possible to achieve a reduction in size, a reduction in weight, reduced power consumption, a simplification of components, a reduction in the number of components, and a reduction in costs. The gear shift operation mechanism is provided with: a screw shaft (31) that constitutes a ball screw (13); a motor (12) that causes the screw shaft (31) to rotate; a nut (33) that is screwed to the screw shaft (31); a clutch (16) that is arranged on the screw shaft (31); and a selection lever (17) that is integrated with the screw shaft (31) by switching on the clutch (16) and that is released from being restrained with respect to the screw shaft (31) by switching off the clutch (16). One end of a main lever (14) engages with the nut (33), the other end engages or connects with a shaft (18), and the selection lever (17) is engaged with the main lever (14). 提供种能够实现小型、轻量化、消耗电力减少、构成零件的简化和个数削减、及低成本化的变速操作机构。具备：构成滚珠丝杠(13)的螺纹轴(31)；使螺纹轴(31)旋转的电机(12)；螺合于螺纹轴(31)的螺母(33)；配置在螺