A transaxle comprises a hydrostatic transmission (hereinafter, “HST”), an axle, a gear train transmitting power from the HST to the axle, a casing carrying the HST, the gear train and the axle and providing a fluid sump. The casing has an air space over the fluid sump of a gear chamber, a breather cap for ventilation of the air space and for an oil cap is installed on a top part of the casing, and a partition plate is installed right under the breather cap and prevents the fluid sup facing directly to the breather cap.