WORKING MACHINE

A work machine prevents a fault in a swing electric motor if an uneven coil temperature increase occurs in the swing electric motor during swing press operation and related operations. The work machine includes: a swing structure (20); an electric motor (25) for driving the swing structure; an electricity storage device (24) connected to the electric motor; an inverter (52) for driving the electric motor; a swing control lever unit (72) that issues a command to drive the swing structure (20); rotational speed detecting device (25a) that detects swing speed of the swing structure; and a controller (80) that controls torque of the electric motor (25). The controller (80) reads the swing speed of the swing structure (20) detected by the rotational speed detecting device to control such that, when the swing speed is zero, the torque of the electric motor (25) is smaller than a maximum torque value and, when the swing speed is a first rotational speed higher than zero, the torque of the electric motor (25) is the maximum torque value.