The electric curtain-closmg device (1) is provided with a curtain rail (200) and a movable body (100) disposed inside the curtain rail (200). The curtain rail (200) has a hollow part in which the space extends in the longitudinal direction and an opening in the lower surface thereof that is open in the longitudinal direction. On the inside of the right and left sides configuring the hollow part, power supply patterns (21 1, 212) for supplying electricity are disposed in the longitudinal direction. The movable body (100) has electrodes that connect respectively to the power supply patterns (21 1 , 212), an electric motor that rotates in one direction or the reverse when electricity is supplied through said electrodes, and a hanger (130) for hanging the curtain. The electric motor drives the movement of the movable body (100). When the movable body (100) is disposed in the hollow part of the curtain rail (200), the hanger (130) protrudes :from the opening of the curtain rail (200).
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