A mounting device includes a mounting head, having a rotating body, which turns multiple pickup members by rotating the rotating body, in which the rotating body holds multiple pickup members, each of which being configured to pick up a component, the multiple pickup members being disposed at predetermined intervals along a predetermined circumference of the rotating body, and executes a forward rotation pickup processing of causing the pickup members to pick up the components from a supply section for supplying the components, and rotates the rotating body forwards, and when at least one of the pickup members is vacant resulting from an error of not holding the component, executes a backward rotation pickup processing which includes a processing of causing the rotating body to rotate backwards and a processing of causing the vacant pickup member to pick up the component from the supply section.