A mechanism for opening and closing an opening portion of a make-up brush device, said mechanism comprising: - an outer frame having an outer wall member and in which is formed an opening portion, - a lid member for operatively opening the opening portion in a opened state and closing the opening portion in a closed state, said lid member having a surface located inwardly of the opening portion, one end and another end; - a rotation supporting shaft disposed on an outer side of one end of the outer wall member that faces the opening portion; and, - an opening and closing member operating for causing the lid member to open and close the opening portion, said opening and closing member having a head end, said head end being made to slide out of and into the opening portion inside the outer wall member, said lid member having a wound section disposed on the one end of the lid member and being wound around the rotation supporting shaft, said wound section having a head end; said one end of the lid member being supported pivotally by the rotation supporting shaft surrounded by the wound section, when the opening portion is closed by the lid member: ▪ the head end of the wound section surrounding the rotation supporting shaft extends inwardly of the opening portion until it reaches a point that is located closer to the inward direction of the opening portion than a point in which the rotation supporting shaft is located; and ▪ said opening and closing member having a hooked portion on the outer wall thereof on the side on which the head end of the opening and closing member being made to slide out of and into the opening portion, the hooked portion having the head end directed from the inner side toward the outer side of the outer wall member, ▪ the head end of the wound section of the lid member and the head end of the hooked portion are brought closer to each other so that they can face opposite each other, when the opening portion is opened from its closed state: - the opening and closing member is operated so that its head end slides out of the opening portion, and engages the surface of the lid member, causing the one end of the lid member to rotate about the rotation supporting shaft and thereby permitting the opening portion to be opened; Characterized in that when the opening portion is closed from the opened state, the opening and closing member is operated so that the hooked portion slides back into the opening portion, causing the head end of the hooked portion to engage the head end of the wound section and whereby this engagement is causing the one end of the lid member to rotate about the rotation supporting shaft, in the closed state of the lid member, the other end of the lid member closes the opening portion, and the head end of the wound section is engaged with the head end of the hooked portion of the opening and closing member so as to prevent the opening of the opening portion by holding the other end of the lid member. and, - the head end of the wound section is engaged with the head end of the protrusion of the lid member so as to prevent the opening of the opening portion by holding the other end of the lid member. - an outer frame having an outer wall member and in which is formed an opening portion, - a lid member for operatively opening the opening portion in a opened state and closing the opening portion in a closed state, said lid member having a surface located inwardly of the opening portion, one end and another end; - a rotation supporting shaft disposed on an outer side of one end of the outer wall member that faces the opening portion; and, - an opening and closing member operating for causing the lid member to open and close the opening portion, said opening and closing member having a head end, said head end being made to slide out of and into the opening portion inside the outer wall member, ▪ the head end of the wound section surrounding the rotation supporting shaft extends inwardly of the opening portion until it reaches a point that is located closer to the inward direction of the opening portion than a point in which the rotation supporting shaft is located; and ▪ said opening and closing member having a hooked portion on the outer wall thereof on the side on which the head end of the opening and closing member being made to slide out of and into the opening portion, the hooked portion having the head end directed from the inner side toward the outer side of the outer wall member, ▪ the head end of the wound section of the lid member and the head end of the hooked portion are brought closer to each other so that they can face opposite each other, - the opening and closing member is operated so that its head end slides out of the opening portion, and engages the surface of the lid member, causing the one end of the lid member to rotate about the rotation supporting shaft and thereby permitting the opening portion to be opened; - the head end of the wound section is engaged with the head end of the protrusion of the lid member so as to prevent the opening of the opening portion by holding the other end of the lid member.