Disclosed is a medical tissue extraction instrument, which can allow an inspector to accurately locate a fine needle at a desired tissue extraction position without any need for assistance while assuring stable tissue extraction. The medical tissue extraction instrument includes a tissue extraction controller to control the pressure of a suction tube connected to a fine needle during extraction of tissue. The tissue extraction controller includes a suction pressure generator taking the form of a footboard and adapted to control a suction operation of the suction tube by being pushed downward.