A control device for an opening/closing member includes a speed detecting unit, a variation calculating unit, a judgment unit, a control unit, and a state detecting unit. The speed detecting unit detects a rotation speed of a motor for opening/closing the opening/closing member. The variation calculating unit calculates the variation in the rotation speed based on a present value and a past value of the rotation speed. The judgment unit compares the variation to a predetermined threshold value and judges whether or not a foreign object is trapped in the opening/closing member based on the comparison. The control unit controls the motor to open or stop the opening/closing member when the judgment unit judges that there is a foreign object trapped. The state detecting unit detects a state of the opening/closing member or a state of the surroundings of the opening/closing member.