To provide a transmission for an electric vehicle, not consuming electric power for transmission shifting.

A transmission for an electric vehicle includes: a planetary gear mechanism 40 having a centrifugal clutch 20 constituted so that rotary torque transmitted to an input member 21 is transmitted to an output member 25, when a rotating speed of the input member 21 rotatably connected to an input shaft 11 is connection start rotating speed or higher, a sun gear 41 functioning as an input element, a ring gear 44 functioning as a fixed element, and a carrier 43 rotated at a reduced rotating speed; and a first one-way clutch 30 having a first member 30a fixed to a housing 10, and a second member 30b not rotatable in a reverse rotational direction with respect to the first member 30a. The sun gear 41 is rotatably connected to the input shaft 11 and is also connected to the input member 21, the ring gear 44 is connected to the second member 30b and is also connected to the output member 25, and the carrier 43 is rotatably connected to an output shaft 12.