To provide a safety cover also serving for increasing propulsion for protecting a ship body and capable of solving a structural fuel problem for eliminating various obstruction caused from peripheral driftage, a wave and a structure when sailing by a ship with a submerged propelling engine.

A grating 1 is arranged in a front part, a cover body 4 provided with a stabilizer 2 is arranged in a required place, the cover body 4 is arranged at the ship's bottom 3, a bearing 6 for reinforcing operational stabilizers 7 arranged in the ship 5 with the submerged propelling engine is arranged in an inside contrast position of the cover body 4, and when using this safety cover by being installed in the required place of the ship 5, a conventional problem can be eliminated and solved.