BREATHER STRUCTURE OF OUTDOOR DEVICE

PROBLEM TO BE SOLVED: To have a function of preventing the penetration of water from outside, in addition to the function of the dew prevention and humidity resistance of an outdoor device. SOLUTION: This breather structure is provided with a block body 120 at the flank of the casing 100 of an outdoor device, and is provided with a pipe 130 at its bottom face. A cap body 140 is mounted at the bottom of the pipe 130. The first breather 180 is made at the center of the cap body 140, and the second breather 190 around it. Moreover, the third breather 170 is made at the middle of the pipe 130. A main circulation path 150 which has a taper face 160 is made inside the pipe 130, and a ball 200 is arranged inside. When a fast water current flows in from the first breather 180, the ball 200 is pushed up and sticks fast to and welds together with the taper face 160, and blocks the main circulation path 150 to prevent the penetration of water.