A drive motor (16) comprises a rotor (52), a crankshaft (17), and a balance weight (53). The balance weight (53) has a balance part (53a), an engaging part (53b), a shaft-abutting part (53c), and a coupling part (53d). The engaging part (53b) is disposed on a side of the crankshaft (17) that is opposite from the balance part (53a). The engaging part (53b) engages with the crankshaft (17) so as to limit movement of the balance part (53a) caused by centrifugal force. The shaft-abutting part (53c) is positioned between the crankshaft (17) and the balance part (53a) and is coupled with the engaging part (53b) and comes into contact with the crankshaft (17). The coupling part (53d) couples the balance part (53a) and the shaft-abutting part (53c). The length of the shaft-abutting part (53c) running along a radial direction of the rotor (52) is shorter than the length of the engaging part (53b) running along the radial direction of the rotor (52).
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