To provide a tandem type trochoid pump capable of improving workability during assembling without increasing the size of a housing, and also to provide a method of manufacturing the tandem type trochoid pump.

The tandem type trochoid pump A is provided with a drive shaft 6 in which a two-face width part 6c is formed in a first end 6a; a spacer 3 partitioning between a first trochoid pump 4 and a second trochoid pump 5; a first fixation part 61 comprising a fitting hole 4c of a first inner rotor 4a and the two-face width part 6c; and a second fixation part 62 comprising a pin hole 6d, a pin 10 and a pin groove 5d of a second inner rotor 5a.