Abstract: In an oxygen concentrator, a housing has a through hole formed therein, and a handle portion provided adjacent to the through hole. The through hole is formed so as to extend toward an other side in an axial direction of the housing from a first opening, the first opening being defined at least by a back-side end of a top face portion, two extension portions, and an upper end of the handle portion, and has an interior space continuously extending between the first opening and a second opening defined at least by a lower end of the handle portion and an upper end of the back face main body portion and disposed on the other side in the axial direction with respect to the first opening.

Abstract: A relay includes: a pair of fixed terminals, each being arranged to have a fixed contact on a one-end face; a movable contact member arranged to have a pair of movable contacts that are correspondingly opposed to the respective fixed contacts; and a driving structure operated to move the movable contact member. In a moving direction of the movable contact member, a side where the fixed contacts are located is called a first side, and a side where the movable contacts are located is called a second side. The movable contact member includes: a center section located between the pair of movable contacts and located on the second side relative to the movable contacts; and a pair of extended sections located between the center section and the pair of movable contacts and extended in a direction including a component of the moving direction.

Abstract: A relay includes: a pair of fixed terminals, each being arranged to have a fixed contact on a one-end face; a movable contact member arranged to have a pair of movable contacts that are correspondingly opposed to the respective fixed contacts; and a driving structure operated to move the movable contact member. In a moving direction of the movable contact member, a side where the fixed contacts are located is called a first side, and a side where the movable contacts are located is called a second side. The movable contact member includes: a center section located between the pair of movable contacts and located on the second side relative to the movable contacts; and a pair of extended sections located between the center section and the pair of movable contacts and extended in a direction including a component of the moving direction.