A fastening part tightening management system (1) that manages a tightening state of a fastening part such as a screw to fix a constituent part of an aircraft in an aircraft assembling process includes a manual torque wrench (2) that tightens a fastening part up to a set torque while activating a tightening torque and detects and transmits tightening torque information acting on the fastening part, a marking pen (3) that performs marking to the fastening part, the tightening operation of which is ended by the manual torque wrench (2), detects a writing pressure in the marking, and transmits marking completion information; an information processing device (5) that determines a tightening state of the fastening part based on the tightening torque information and the marking completion information, and a mobile information terminal (4) that notifies an operator of a determination result obtained by the information processing device (5).