Tensioner and rocking lever

A tensioner unit comprising:

• a tensioner and a rocking lever,
• the tensioner comprising:
• a tensioner body having a cylindrical plunger housing hole that is open at one end;
• a cylindrical plunger slidably inserted into the plunger housing hole;
• and
• bias means for biasing the plunger in a protruding direction, wherein
• a plunger pin hole is formed in the plunger,
• a body pin hole is formed in the tensioner body such that, at a position to which the plunger is pushed back, the body pin hole aligns with an axis of the plunger pin hole, and
• the body pin hole is formed in a tip protruding portion provided so as to protrude from a side of an opening of the plunger housing hole;
• and
• the rocking lever comprising:
• a guide surface that comes into sliding contact with a traveling endless transmission member;
• a boss portion supported so as to be able to rock;
• and
• a pressing surface provided on a side of the rocking lever opposite to the guide surface, wherein
• lips protruding from the pressing surface are provided on opposite sides of the pressing surface in a width direction thereof, and
• at least one of the lips has a thinned portion thinned in the width direction.