A steam generator for a washing device is disclosed, in which the power supplied to a heater is cut off before a water level of water used to generate steam is lower than an end of the heater, thereby avoiding a risk of fire. The steam generator includes a case coupled with the main body of the washing device. A heater is provided inside the case. A temperature fuse is provided inside the case when a coupling portion couples the case with the main body of the temperature fuse is configured to be higher than the heater based on a horizontal line.