Provided is a relay device capable of moving objects to be conveyed from a conveying section of a continuous conveying system to a conveying section of an intermittent conveying system in various modes. The relay device (10) includes: a first conveying section (20) that conveys the objects (1) to be conveyed, continuously in a forward direction (D1a) in a first direction; a second conveying section (26) that transfers a plurality of assembly sections (29) intermittently in the forward direction (D1a) in the first direction; a relay conveying section (50) provided between the first conveying section (20) and the second conveying section (26); and a relay driving section (60) that moves the relay conveying section (50) in the first direction. The relay driving section (60) moves the relay conveying section (50) in the forward direction (D1a) in the first direction, at the same speed as a speed at which the plurality of objects (1) are conveyed in the forward direction (D1a) of the first direction by the first conveying section (20), at least while the first pusher (31) moves the plurality of objects (1) in the forward direction (D2a) of the second direction.