To provide a safety helmet capable of reducing humidity inside the helmet, by forming air vents in the helmet and making ventilation naturally occur.

In this safety helmet with the air vents, a circular opening 2 is bored in a top area of the helmet, a rising part 3 for reinforcing the opening 2 against deterioration of strength is formed in an peripheral area of the opening 2 by integrating itself with a main body of the helmet, a cap 4 which covers and protects the opening 2 against a coming-and-flying object, a falling object, etc., is attached to the rising part 3, and a plurality of the air vents 5 is formed in an upper peripheral area of the rising part 3. Further, the air vents are so structured that a plurality of partition plates 6 is regularly attached to a bottom peripheral area of a top plate 9 of the cap 4.