To provide an analyzer capable of smoothly inserting an insertion member into a cuvet even in the case where a positional shift of the insertion member and the cuvet occurs, a washing device, a dispenser and a stirrer.

By providing a guide member 3143 which is arranged to the upper part of the opening part of the cuvette 30 for holding a liquid and guiding the insertion of a suction nozzle 391, that constitutes a washing nozzle, an injection nozzle 392 and an overflow suction nozzle 393 into the cuvette 30, the collidion of the washing nozzle with the edge of the cuvette 30 is prevented, when the washing nozzle is inserted in the cuvette 30, even when the positional shift of the washing nozzle and the cuvette 30 occurs and the washing nozzle is inserted smoothly in the cuvette 30.