This sample rack conveying apparatus is provided with a pusher unit, a linear motion guide, and a conveyance drive mechanism. The pusher unit has a base portion, a moving member, and a base-side guide. The base portion is supported by the linear motion guide so as to be movable in a first guide direction. The moving member is provided with a pusher that pushes a sample rack. The base-side guide supports the moving member such that the moving member is movable in a second guide direction that crosses the first guide direction.