To eliminate the laboriousness in removing the air in the projecting part at the front end of a condom and the failure associated therewith at the time of mounting the condom.

This condom is subjected to air removal in such a manner that the projecting part at its front part is flattened. After the condom is mounted at the penis in the form of closing the straight mouth part 4 on the rear surface of the projecting part, the oblate-like thin-film small piece 3 which is easily dissolved by a secretion to open a hole is extended there. As a result, the laboriousness of removing the air by squeezing the projecting part at the front end with the fingertip at the time of mounting is eliminated. Even a person handicapped on this fingers of one hand is able to mount the condom with his fingers of another hand. The small piece closing the straight mouth part 4 at the rear surface of the projecting part is easily ruptured at its central part by the movement of lowering the cylindrical part of the main body curved to a ring form at the time of mounting. The small piece is otherwise easily dissolved by the initial secretion or ejaculated sperm to make the path to ejaculate the sperm into the projection part.