Valve mechanism and shock absorber

A valve mechanism, comprising:

• a cylindrical body having a hollow portion penetrating in an axial direction;
• a plurality of valve bodies including a first valve body having a through-hole penetrating in the axial direction and being arranged to be in contact with an axial end surface of the cylindrical body;
• and
• a drive valve arranged movably in the axial direction and disposed on a side opposite to the cylindrical body with respect to the plurality of valve bodies, wherein
• the drive valve includes,
• a shaft portion having therein a flow path penetrating in the axial direction, and
• a first step portion extending from an outer peripheral surface of the shaft portion to a radial outside of the shaft portion and a second step portion,
• the shaft portion has a protrusion portion protruding further toward the cylindrical body side than the first step portion and a base portion extending to a side opposite to the protrusion portion with respect to the first step portion,
• a gap between the plurality of valve bodies is changed by elastically deforming an inner peripheral portion of the valve body, which comes into contact with the drive valve which is moved in a direction approaching the valve body, in a direction approaching the cylindrical body with respect to an outer peripheral portion of the valve body,
• the second step portion extends from an outer peripheral surface of the protrusion portion radially outward of the protrusion portion further to the protrusion portion side than the first step portion,
• an outer diameter of the second step portion is smaller than an outer diameter of the first step portion,
• the first step portion is in contact with a second valve body, which is included in the plurality of valve bodies and is disposed closest to the drive valve, and
• the second step portion is capable of coming in contact with the valve body disposed further on the cylindrical body side than the second valve body.