Opening/closing body operation device

An opening/closing body operation device for operating an opening/closing body, which swings up and down, so as to open and close; wherein the opening/closing body operation device has a driving unit, a slider which is moved up and down by the driving force from the driving unit and which is linked to the opening/closing body, and a guide member having the slider slidably disposed in the interior. The slider includes a main slider body, a sliding member that slides against the guide member, and an elastic member provided between the main slider body and the sliding member so as to be capable of supporting the load applied to the slider when the opening/closing body is opened or closed. The slider has formed therein a deformation allowance space for allowing elastic deformation of the elastic member caused when the slider is pressed into the guide member. Using the above opening/closing body operation device makes it possible to reliably support the load applied to the slider during an operation to open or close the opening/closing body.