A drive chain includes two end chain components and a connecting plate. Each of the end chain components has a pin hole and a connecting pin. The connecting pin includes a main segment inserted into the pin hole and having a diameter, an anchoring end segment axially spaced apart from the main segment and having a diameter, and a constricted neck extending between the main segment and the anchoring end segment. The connecting plate has two spaced anchoring holes each having a diameter that is originally smaller than the diameter of the main segment and larger than the diameter of the anchoring end segment. The main segment of the connecting pin is force-fitted in a corresponding one of the anchoring holes so that the end chain components are joined to each other. A tool device to assemble or disassemble the drive chain is also disclosed.