A drive device includes a motor, an inverter to control current supplied to the motor, plate-shaped busbars that electrically connect the motor with the inverter, and a housing that accommodates the motor, the inverter, and the busbars. The housing includes a partition wall that partitions the inside of the housing into a motor housing and an inverter housing. The partition wall is provided with a through hole. Each busbar includes a motor connection terminal, an inverter connection terminal, a first portion extending from the motor connection terminal toward the through hole, and a second portion extending from the first portion to the inverter connection terminal through the through hole. At least two busbars overlap each other in a plate thickness direction inside the through hole.