A flexible connection pipe for a cryocooler includes a connection hose that includes a flexible pipe which is provided with a pipe end portion and a flexible tube which is provided with a tube end portion coming into close contact with the pipe end portion and which is inserted into the flexible pipe and a connection adapter that connects the connection hose to a constituent element of the cryocooler, the connection adapter being adjacent to the tube end portion and being fixed to the pipe end portion.