The present invention provides a measuring tape with the self-locking type braking mechanism which can reduce the impact upon stopping the tape while winding up the tape having pulled out, is excellent in keeping the tape in the halting condition, and can reduce the resistance upon pulling out the tape. The brake operation means at least comprises a brake operation button operable from an outsideof a housing, a braking roller formed of a elastic material connected to the brake operation button for applying a potential energy to a tape in braking direction via leaf spring. The braking roller is wedged between an upper surface of the tape coming out of a rotation drum and a predetermined member above the tape to apply the brake to the tape.