To solve the problem of the conventional Western-style toilet bowl in which: while men are told by housewives to sit to urinate since urine hits a water surface inside a toilet bowl and the splash scatters and stains on the floor outside or the like when the men urinates to a Western-style toilet bowl while standing, men cannot easily accept that thinking since it is beneath their dignity.

In the splash prevention of the Western-style toilet bowl by blowout of compressed air, a compressed air pump 7 is attached to a Western-style toilet bowl 1, and a pipe 5 with a hole 4 opened at an oblique lower part is attached to an inner periphery lower surface 3 of a toilet seat 2. Compressed air is sent into the pipe 5, high pressure air 10 is blown out obliquely downwards from the hole 4 of the pipe 5, and splash that hits a water surface 8 and an inner surface 9 of the toilet bowl 1 is prevented by the blown high pressure air 10.