To provide a damper allowing improvement of durability by suppressing deterioration and easy assembling.

This damper 1 is provided with an actuator A provided with a motion converting mechanism 2 for converting a linear motion into a rotary motion and a motor M connected to a rotating member 3 presenting the rotary motion in the motion converting mechanism 2, and a hydraulic damper D connected to a liner moving member 4 presenting the linear motion in the motion converting mechanism 2. The linear moving member 4 and the hydraulic damper D are connected via a joint J allowing eccentricity and deflection angle.