A laterally installing wheel including a rim in which a rim main portion and a side ring are disconnectably coupled to each other at a coupling portion of the rim main portion and the side ring, wherein the coupling portion is constructed such that a gap between the rim main portion and the side ring is inconspicuous from outside in the axial direction of the wheel. The coupling portion is provided at an axially inner portion of the rim. In a case where the coupling portion is provided at an axially outer portion of the rim, the coupling portion is located at an inconspicuous portion.