A wheelchair excellent in assembly/disassembly efficiency, maintenanceability, applicability, and versatility is provided that is configured to be easily transformed between a folding wheelchair and a non-folding wheelchair by selecting and replacing parts, thus eliminating the necessity of preparing two types of wheelchairs (i.e., folding wheelchair and non-folding wheelchair) and reducing the burden on a user and/or a caregiver. The wheelchair is usually used as the non-folding wheelchair suitable for, especially, disabled persons who commute to school or work, participate in social activities, and the like, while being transformed as the folding wheelchair as needed so that the wheelchair is compactly folded to be portable. The wheelchair (1) includes right and left side frames (2a, 2b) and a connection unit (3) connecting the side frames to each other. The side frames each include a unit fixture (20) for detachably fixing the connection unit. The connection unit is selectable from a foldable connection unit connecting the right and left side frames with a distance therebetween changeable or a non-foldable connection unit connecting the right and left side frames with the distance therebetween kept constant.
