A bending device with which bending motions can be controlled with ease and good controllability includes a plurality of elastic tubes disposed inside an elastic tube. The elastic tubes each include an elastic tube body and a non-stretching body. The portion of the elastic tube body opposite the portion in which the non-stretching body is fixed inflates in a circumferential direction of the elastic tube body in response to increase in its internal pressure, causing the elastic tube to bend. The portion of the elastic tube body in which the non-stretching body is fixed is thicker than the remaining portion of the elastic tube body.
