Provided is a packing arrangement structure which can prevent rotation of a packing. The packing arrangement structure includes an annular packing disposed between a first member and a second member. The packing includes an annular portion main body extending in an axial direction of the packing and a protruding portion protruding from the annular portion main body in an outward direction or in an inward direction. The first member is provided with a recessed portion configured to house the protruding portion and formed into a shape corresponding to the protruding portion. The protruding portion is formed such that a circumferential dimension of a top portion thereof located in a protruding direction is greater than a circumferential dimension between basal parts thereof.