To stabilize the extend of braking performance by way of antilocking in this centrifugal internal expanding brake.

In this centrifugal internal expanding brake 1 where a rotator 3 is set up on the inside of a fixed drum 2, setting up a pair of brake shoes 6 in this rotator 3, and these paired brake shoes 6 come into slidingly contact with the fixed drum 2 against a spring 7 by a rotation of this rotator 3 for the sake of braking, each anchor pin 5 is installed in a central part halving each individual brake shoe 6, and the spring 7, energizing the brake shoes 6 in the non-braking direction, is installed in space between both ends being opposed, and further the anchor pins 5 are set up in respective opposed positions, and thus each of these brake shoes 6 is made up to be shiftable only in a direction (x) connecting the paired anchor pins 5.