To provide a cleaning apparatus capable of ejecting air, a cleaning solution or the like from a constantly definite distance into a square-shaped can to completely clean the whole area of a can inside by a jet nozzle moving along the inside shape of the can, and capable of rotatably moving the jet nozzle substantially squarely along the can inside with a simple formation.

The main shaft (2a) of a crankshaft (2) is freely rotatably provided at the central position of a fixed internal gear (1), and a small gear (3) loosely fitted to the eccentric shaft (2b) of the crankshaft (2) is engaged with the internal gear (1). A regularly triangular jet nozzle retention plate (4) is fixed to the small gear (3), and a jet instrument (5) projecting from each triangular top (4a) is mounted to the retention plate (4). A drive motor (8) is provided to drive the main shaft (2a) of the crankshaft (2). In the crankshaft (2), a through-hole (2c) communicating from the main shaft (2a) to the eccentric shaft (2b) is bored, and the jet instrument (5) and the eccentric shaft (2b) are connected by a tubular body (7).