To provide a pressure container improving pressure resistance by avoiding stress concentration on a joint part of a closing member due to a pressure rise.

An accumulator 1 includes: a bottomed cylindrical body 2; and the closing member 3 for closing an opening end 2a of the body 2. The accumulator 1 further includes: a first joint part 8 to which an abutment part 7 of the opening end 2a of the body 2 on the closing member 3 is integrally jointed; and a second joint part 9 to which part of the closing member 3 inserted to inside of the opening end 2a of the body 2 and an inner wall (female screw groove 2b) of the body 2 are integrally jointed.