The purpose of the present invention is to provide an engine in which operation of a control system and communication of information can be performed easily form above the engine. A blank part is formed in a top cover provided on an upper surface of an engine arranged in an engine room of a ship so as to penetrate vertically the top cover, an engine side operation part is arranged so as to face the blank part, and an upper end of the engine side operation part is positioned lower than an upper surface of the top cover.