In this study, we investigated the wheelchairs used for older people who live in aged-care nursing home to clarify the current problems with using wheelchairs in this setting. We measured the fit between the sizes of the wheelchair and the physical dimensions of the older people. We conducted a research of 61 participants who had used wheelchairs on a daily basis and could not move around without them. We measured the wheelchair sizes and the physical dimensions of the participants by the Wheelchair Measure Set, and compared measured data with the recommended value stipulated by the special interest group (SIG) of a rehabilitation engineering society of Japan. The main purpose of using wheelchairs were to move around (98%), sitting (93%), and eating (90%). The mean daily usage of wheelchair was 9.9 ± 4.0 hours, and maximal score was 16 hours. Over 80% of the participants had used wheelchairs that were provided by the aged-care nursing home. Most of the wheelchairs were lacking in adjustable functions, and additionally about half of the wheelchairs did not have enough air or had flat tires. In terms of the fit between the wheelchair sizes and physical dimensions of the older people, most of the wheelchairs were much bigger than the recommended sizes. Therefore, older people who live in aged-care nursing home spent much of their day in poorly fitting wheelchairs that were provided by the facility.