Timer for microwave oven

A timer for a microwave oven includes an actuating lever operating auxiliary power switch when pushed by a power control cam installed in a timer casing. A pushing unit is installed adjacent to the power control cam to move the power control cam up and down and pushes the power control cam so as to disconnect the actuating lever from the power control cam and hold the power switch on when a power level of the microwave oven is set to a maximum using a power control shaft. The pushing unit has a shaft part extending toward an intermediate gear disposed between the power contact shaft and the power cam. A compressing projection is provided on the intermediate gear pushing the shaft part of the pushing unit to move the power control cam.