In 1948, being a vice-chairman of the House of Councilors, Matsumoto made a refusal to the Emperor's audience in the case known as "The Sideways Scuttle of a Crab". After that his public offices were banished, but this was cancelled in 1951. In 1953, Matsumoto became a chairman of the . Until his death in 1966, Matsumoto continued his buraku liberation activities.
