| 摘要 |
PROBLEM TO BE SOLVED: To ensure rectilinearity on a slope in spite of a turnable caster. SOLUTION: This caster 2 supporting a supported body 3 such as a frame of a walking assistance vehicle has a rectilinearity fixing means 106 capable of switching between a state allowing a turn of the caster 2 relatively to the supported body 3 and a state that the caster 2 is fixed with the caster faced to at least one of the front and the rear to the advancing direction of the supported body 3.
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