Push-button switch and electronic apparatus having the same

To prevent the local heating of an electronic apparatus chassis, there is provided a push button switch (10), which comprises a substrate (11) having a first contacting part (11a) and a second contacting part (11b) operable to be brought into electrical conduction with the first contacting part (11a), and a flexible electrically insulating sheet (13) covering the substrate (11) and having a click portion (13a) on the inside of which the first and second contacting parts are disposed to be brought into and out of electrical conduction therebetween in response to depression of the click portion. The electrically insulating sheet (13) includes a heat conducting layer (14) extending along the substrate (11).