PROBLEM TO BE SOLVED: To provide a pressure buffer device for a rotary powder compression molding apparatus that can reduce noise and vibration generated as overpressure generated in compression molding by a rotary powder compression molding machine is buffered.SOLUTION: A pressure buffer device 3 comprises: a main body case 51 having a support surface 54a; a piston (spring case 61) having a contact surface 62a made to contact and leave the support surface 54a and housed vertically movably in the main body case 51, pushed with reaction force to molding pressure applied to one of upper and lower pressure rolls in compression molding by a rotary powder compression molding apparatus; a compression coil spring 71 pressing the contact surface 62a against the support surface 54a; and damper means 74 of utilizing fluid resistance of a non-compressive fluid (oil 77). When overpressure is generated in the compression molding, this overpressure is buffered by the compression coil spring 71 and a moving speed of the pis
