An elevator hoisting machine braking apparatus comprising: a rotating body; a brake shoe that can be displaced in such a direction as to contact with or separate from the rotating body; a movable core that is disposed away from the brake shoe in the direction in which the brake shoe can be displaced; a linking member on which an adjusting helical portion is disposed that can be screwed together with a holding helical portion that is disposed on either one of the brake shoe or the movable core, the linking member linking the brake shoe and the movable core to each other, and spacing between the brake shoe and the movable core being adjusted by adjusting an amount of thread engagement of the adjusting helical portion with the holding helical portion; a fixing means that fixes a position of the adjusting helical portion relative to the holding helical portion by pressing the adjusting helical portion against the holding helical portion in a direction in which the brake shoe and the movable core approach each other; a forcing body that forces the movable core in a direction in which the brake shoe contacts the rotating body; and an electromagnet that displaces the movable core in a direction in which the brake shoe separates from the rotating body in opposition to force from the forcing body, characterized in that the holding helical portion is constituted by a first holding internal screw thread portion, and the adjusting helical portion is constituted by an adjusting external screw thread portion; a second holding internal screw thread portion that has a diameter that is larger than a diameter of the first holding internal screw thread portion is disposed so as to be coaxial with the first holding internal screw thread portion on whichever member of the brake shoe and the movable core the first holding internal screw thread portion is disposed; the fixing means is constituted by a nut member on which are disposed: a fixing internal screw thread portion that can be screwed together with the adjusting external screw thread portion; and a fixing external screw thread portion that can be screwed together with the second holding internal screw thread portion; and directions of helices of respective ridges of the first and second holding internal screw thread portions (18,19) are in reverse directions to each other. a rotating body; a brake shoe that can be displaced in such a direction as to contact with or separate from the rotating body; a movable core that is disposed away from the brake shoe in the direction in which the brake shoe can be displaced; a linking member on which an adjusting helical portion is disposed that can be screwed together with a holding helical portion that is disposed on either one of the brake shoe or the movable core, the linking member linking the brake shoe and the movable core to each other, and spacing between the brake shoe and the movable core being adjusted by adjusting an amount of thread engagement of the adjusting helical portion with the holding helical portion; a fixing means that fixes a position of the adjusting helical portion relative to the holding helical portion by pressing the adjusting helical portion against the holding helical portion in a direction in which the brake shoe and the movable core approach each other; a forcing body that forces the movable core in a direction in which the brake shoe contacts the rotating body; and an electromagnet that displaces the movable core in a direction in which the brake shoe separates from the rotating body in opposition to force from the forcing body, characterized in that the holding helical portion is constituted by a first holding internal screw thread portion, and the adjusting helical portion is constituted by an adjusting external screw thread portion; a second holding internal screw thread portion that has a diameter that is larger than a diameter of the first holding internal screw thread portion is disposed so as to be coaxial with the first holding internal screw thread portion on whichever member of the brake shoe and the movable core the first holding internal screw thread portion is disposed; the fixing means is constituted by a nut member on which are disposed: a fixing internal screw thread portion that can be screwed together with the adjusting external screw thread portion; and a fixing external screw thread portion that can be screwed together with the second holding internal screw thread portion; and a fixing internal screw thread portion that can be screwed together with the adjusting external screw thread portion; and a fixing external screw thread portion that can be screwed together with the second holding internal screw thread portion; and directions of helices of respective ridges of the first and second holding internal screw thread portions (18,19) are in reverse directions to each other.