A motorcycle comprising: a motorcycle frame structure; a foot step for a passenger; a rear wheel shock absorber; an operation unit for manually adjusting a characteristic of the rear wheel shock absorber; and a step stay mounted to the motorcycle frame structure and configured to support the foot step, characterized by a reservoir tank for rear wheel brake oil; wherein the step stay comprises: a unit supporting portion configured to support the operation unit; a tank supporting portion configured to support the reservoir tank; and a pannier supporting portion configured to support a front portion of a pannier when mounted to a side portion of a motorcycle body, wherein the pannier supporting portion is disposed rearward of the unit supporting portion, wherein an operation portion of the operation unit is disposed at a position at which overlap of the operation portion with the step stay and the pannier, when mounted to the side portion of the motorcycle body, is avoided as viewed from an outer lateral side, and wherein the operation unit has a rotation axis set so as to be substantially parallel to a lower edge of a rear frame of the motorcycle body which lower edge extends rearward and upward; the tank supporting portion is disposed rearward of and below the unit supporting portion; and the pannier supporting portion is disposed rearward of the tank supporting portion. a motorcycle frame structure; a foot step for a passenger; a rear wheel shock absorber; an operation unit for manually adjusting a characteristic of the rear wheel shock absorber; and a step stay mounted to the motorcycle frame structure and configured to support the foot step, characterized by a reservoir tank for rear wheel brake oil; wherein the step stay comprises: a unit supporting portion configured to support the operation unit; a tank supporting portion configured to support the reservoir tank; and a pannier supporting portion configured to support a front portion of a pannier when mounted to a side portion of a motorcycle body, wherein the pannier supporting portion is disposed rearward of the unit supporting portion, wherein an operation portion of the operation unit is disposed at a position at which overlap of the operation portion with the step stay and the pannier, when mounted to the side portion of the motorcycle body, is avoided as viewed from an outer lateral side, and wherein the operation unit has a rotation axis set so as to be substantially parallel to a lower edge of a rear frame of the motorcycle body which lower edge extends rearward and upward; the tank supporting portion is disposed rearward of and below the unit supporting portion; and the pannier supporting portion is disposed rearward of the tank supporting portion. a unit supporting portion configured to support the operation unit; a tank supporting portion configured to support the reservoir tank; and a pannier supporting portion configured to support a front portion of a pannier when mounted to a side portion of a motorcycle body, wherein the pannier supporting portion is disposed rearward of the unit supporting portion, wherein an operation portion of the operation unit is disposed at a position at which overlap of the operation portion with the step stay and the pannier, when mounted to the side portion of the motorcycle body, is avoided as viewed from an outer lateral side, and wherein the operation unit has a rotation axis set so as to be substantially parallel to a lower edge of a rear frame of the motorcycle body which lower edge extends rearward and upward; the tank supporting portion is disposed rearward of and below the unit supporting portion; and the pannier supporting portion is disposed rearward of the tank supporting portion.