A sample rack conveying apparatus for changing the conveying direction of a sample rack with a single driver, the apparatus comprising: a pusher unit that pushes a sample rack in which a sample container is stored so as to convey the sample rack; a linear motion guide that supports the pusher unit such that the pusher unit is movable in a first guide direction; and a conveyance drive mechanism that moves the pusher unit in the first guide direction, the pusher unit including a base portion which is supported by the linear motion guide so as to be movable in the first guide direction, a moving member which is provided with a pusher which presses the sample rack, a base-side guide which is provided on the base portion and which supports the moving member such that the moving member is movable in a second guide direction which crosses the first guide direction, a rotating shaft which is provided on the moving member, and a rotating member which is supported by the rotating shaft so as to be rotatable within a plane formed by the first guide direction and the second guide direction, wherein the pusher is provided in the rotating member; and a unit guide that guides moving of the moving member in the first guide direction and in the second guide direction, wherein the pusher unit includes an urging member (109a, 109b) which urges the moving member to the unit guide. a pusher unit that pushes a sample rack in which a sample container is stored so as to convey the sample rack; a linear motion guide that supports the pusher unit such that the pusher unit is movable in a first guide direction; and a conveyance drive mechanism that moves the pusher unit in the first guide direction, the pusher unit including a base portion which is supported by the linear motion guide so as to be movable in the first guide direction, a moving member which is provided with a pusher which presses the sample rack, a base-side guide which is provided on the base portion and which supports the moving member such that the moving member is movable in a second guide direction which crosses the first guide direction, a rotating shaft which is provided on the moving member, and a rotating member which is supported by the rotating shaft so as to be rotatable within a plane formed by the first guide direction and the second guide direction, wherein the pusher is provided in the rotating member; and a base portion which is supported by the linear motion guide so as to be movable in the first guide direction, a moving member which is provided with a pusher which presses the sample rack, a base-side guide which is provided on the base portion and which supports the moving member such that the moving member is movable in a second guide direction which crosses the first guide direction, a rotating shaft which is provided on the moving member, and a rotating member which is supported by the rotating shaft so as to be rotatable within a plane formed by the first guide direction and the second guide direction, wherein the pusher is provided in the rotating member; and a unit guide that guides moving of the moving member in the first guide direction and in the second guide direction, wherein the pusher unit includes an urging member (109a, 109b) which urges the moving member to the unit guide.