To dispose a load detector detecting stepping operation force without impairing a longitudinal adjustment function even in a longitudinally adjustable brake pedal device.

A turn member 18 turned around a support shaft 16 through an interlocking link 36 by a turn of a pedal member 14 around a first connection shaft 28 by stepping operation of a stepping part 14p, and displacing a rod 22 through the load detector 20 comprises: (a) a first turn arm 40 connected to the interlocking link 36; (b) a second turn arm 42 connected to the rod 22 through the load detector 20; and (c) a rotor 44 integrally provided with the turn arms 40, 42, and disposed turnably around the support shaft 16, wherein (d) the first turn arm 40 and the second turn arm 42 are disposed in the rotor 44 apart from each other in the axial direction of the support shaft 16.