To provide a partial periodic M-group generation circuit, generating a partial periodic signal which is a partial signal of the period of an M group signal by an arbitrary phase.

A partial period counter circuit 50 counts a clock ck and repeatedly outputs a load signal S50. A starting seed registor 51 stores a starting seed value S51 which is an initial value for supplying for inside of an M-group seed signal generation part 52. The part 52 fetches the value S51 by synchronizing with the signal S50 and generates a partial periodic signal S52 from this value S51, based on a polynomial generated.