Motor current detection circuit

A motor current detection circuit is formed of a current detector for detecting an overloaded state of a motor 12 by comparing a motor current value V3, which represents current flowing through the motor, with a predetermined reference value V1, and a hysteresis generating circuit r5, c1, r4 for generating, in the current detector, a hysteresis characteristic corresponding to an integrated value with respect to time of an increment amount by which the motor current value exceeds the reference value. Chattering in output of the current detector is reduced so that an overloaded state of the motor can be detected quickly.