Projection device

A projection device, comprising:

• a shell, a lens, two first ribs, two second ribs, and a sliding cover;
• wherein
• the shell has a top plate, a left sidewall, and a right sidewall, the top plate is respectively connected to the left sidewall and the right sidewall, and the top plate has an opening;
• the lens is disposed in the shell and exposed by the opening;
• the two first ribs are disposed on the top plate, extending directions of the two first ribs are perpendicular to the left sidewall and the right sidewall, and the opening is disposed between the two first ribs;
• the sliding cover is slidably disposed on the shell and configured to cover the opening;
• and
• the two second ribs are disposed on a top cover body of the sliding cover, and one of the two second ribs is located between the two first ribs;
• wherein the sliding cover is configured to slide relative to the shell, when the sliding cover is at an open position, the top cover body does not cover the lens, and when the sliding cover is at a closed position, the top cover body covers the lens, and the two second ribs bear against the two first ribs corresponding to thereof.