To provide a buffering member capable of easily linking an output shaft and a passive shaft so as not to cause misalignment or looseness of the shaft centers, suppressing outside forces working directly from one side shaft toward the other side shaft and suppressing occurrence of the effects caused by thermal conductivity and thermal expansion, and to provide a uniaxial eccentric screw pump provided with the buffering member.

The buffering member 82 is interposed between the output shaft 70a and a drive shaft 56 and is capable of linking both shafts. The buffering member 82 is made of a resin and has a tubular buffering member body 84 and a coupling means 90. The buffering member body 84 is inserted into a buffering member insertion part 56a disposed on the end of the drive shaft 56 and, thereby, assumes a state in which the buffering member body 84 is fitted in and coupled to the drive shaft 56. Further, the output shaft 70a is inserted into an insertion part 88 disposed on the cushioning member body 84, a key 92 which forms the coupling means 90 is engaged with a key seat 70b and thereby, the output shaft 70a and the buffering member body 84 assume a linked state.