To provide a sink where washing work is performed efficiently by holding an auxiliary table at a work position during washing work.

The sink is provided with a sink main body 4, the auxiliary table 6 fitted to the side face of the sink main body 4, and a fixing member 8 for fixing the table 6 to the work position. The table 6 has first supporting parts 42 and 44 for fitting it to the sink main body 4 and second supporting parts 46 and 48 for holding the table 6 at the work position. The second supporting parts 46 and 48 are detachably mounted to the sink main body 4 by turning the table 6 upward beyond the work position in the state of mounting the first supporting parts 42 and 44 to the sink main body 4. The member for fixing 8 is detachably inserted to a space 94 between the table 6 and the main body 4, so that turning movement of the table 6 beyond the work position is blocked, and the table is locked at the work position.