The moving body separating device includes a separating device main body, which separates an upstream-side moving body disposed on a base plate to be movable in a straight-line direction and a downstream-side moving body connected to the upstream-side moving body on the base plate at a prescribed separating point when moving to a downstream side. The separating device main body includes a rotary body for pushing out the downstream-side moving body towards the downstream side through a rotary action, a supporting shaft held by the upstream-side moving body for supporting the rotary body to be freely rotatable, and an original-position returning spring held by the supporting shaft for returning the rotary body to an original position. A protrusion member which applies a rotary pressure force to the rotary body is fixed at a prescribed separating point on the base plate by corresponding to one end part of the rotary body.