A flexible tube for endoscope comprising: a pipe-shaped flexible tube material; and a covering layer of a multi-layered constitution, in which the entire peripheral surface of the axis circumference of the flexible tube material is covered with a plurality of layers (17, 18) molded by extrusion molding, in which a plurality of kinds of resins (39, 40) each having different molten condition each other is supplied in an overlapped manner to one molding die to which the flexible tube material is inserted, wherein the resin used for molding of the first layer of the covering layer and the resin used for molding of the second layer that contacts the first layer is in conditions that the difference at the 100% modulus value, which represents a hardness after molding, is equal to or more than 10 MPa, wherein the first layer of the covering layer is an inner layer which covers the entire peripheral surface of the axis circumference of the flexible tube material, and the second layer is an outer layer which contacts the inner layer and covers the entire peripheral surface of the axis circumference of the inner layer, characterized in that the difference of the melt viscosity in the temperature of 150°C to 200°C, where the resins are molten for molding, is equal to or less than 2500 PaS, a thickness ratio between the inner layer and the outer layer is 1:9 at a proximal end thereof, the thickness ratio between the inner layer and the outer layer is 9:1 at a distal end thereof, and the thickness ratio reversely changes between the both ends, and the thickness of the covering layer is in the range from 0.2 mm to 1.0 mm, and the resin used for molding the inner layer is a soft resin, and the resin used for molding the outer layer is a hard resin. a pipe-shaped flexible tube material; and a covering layer of a multi-layered constitution, in which the entire peripheral surface of the axis circumference of the flexible tube material is covered with a plurality of layers (17, 18) molded by extrusion molding, in which a plurality of kinds of resins (39, 40) each having different molten condition each other is supplied in an overlapped manner to one molding die to which the flexible tube material is inserted, wherein the resin used for molding of the first layer of the covering layer and the resin used for molding of the second layer that contacts the first layer is in conditions that the difference at the 100% modulus value, which represents a hardness after molding, is equal to or more than 10 MPa, wherein the first layer of the covering layer is an inner layer which covers the entire peripheral surface of the axis circumference of the flexible tube material, and the second layer is an outer layer which contacts the inner layer and covers the entire peripheral surface of the axis circumference of the inner layer, characterized in that the difference of the melt viscosity in the temperature of 150°C to 200°C, where the resins are molten for molding, is equal to or less than 2500 PaS, a thickness ratio between the inner layer and the outer layer is 1:9 at a proximal end thereof, the thickness ratio between the inner layer and the outer layer is 9:1 at a distal end thereof, and the thickness ratio reversely changes between the both ends, and the thickness of the covering layer is in the range from 0.2 mm to 1.0 mm, and the resin used for molding the inner layer is a soft resin, and the resin used for molding the outer layer is a hard resin.