To provide a wetsuit so designed as to easily join divided parts of a jacket and trousers of a two-piece type wetsuit without using a clasp folding as in conventional one to increase water tightness of the divided parts.

The wetsuit is structured as follows: disposing a first belt-state part 9 formed of waterproof fabric at the circumference of the back side of a body part 7 at the upper part of trousers 5; disposing a second belt-state part 13 formed of waterproof fabric at the circumference of the back side of the hem 11 of a jacket 3; tucking the first belt-state part 9, the second belt-state part 13, the body part 7 at the upper part of the trousers 5, and the hem 11 of the jacket 3 in a four-stories sandwiched state in order starting from the near side of the wearer's body; and attaching detachable tapes 15 (Velcro tape (R)) to parts joined with each other so as to prevent displacement.