An optical waveguide element comprising: a substrate (230, 2130); an optical waveguide (244b-1, 2134) formed in the substrate (230, 2130); and an electrode for controlling light wave propagating through the optical waveguide (244b-1, 2134), wherein the optical waveguide (244b-1, 2134) and the electrode have an intersection (370, 770, 1270, 2140) in which the optical waveguide (244b-1, 2134) and the electrode intersect with each other, and at the intersection (370, 770, 1270, 2140), the electrode has a multilayer structure including a plurality of metal layers (450-1, 450-2, 650-1, 650-2, 650-3, 650-4, 850-1, 850-1', 850-2, 1350-1, 1350-2) made of a metal material, wherein a resin layer (452, 852, 852', 1352, 1352', 2138) made of a resin material is formed between the electrode and the substrate(230, 2130), wherein the resin layer (452, 852, 852', 1352, 1352', 2138) is formed across at least two intersections (370, 770, 1270, 2140), and the resin layer (452, 852, 852', 1352, 1352', 2138) is formed such that a length of the resin layer (452, 852, 852', 1352, 1352', 2138) along a waveguide direction of the optical waveguide (244b-1, 2134) is longer than a length of the metal layer (450-1, 450-2, 650-1, 650-2, 650-3, 650-4, 850-1, 850-1', 850-2, 1350-1, 1350-2) which is adjacent to the resin layer along the waveguide direction of the optical waveguide (244b-1, 2134), characterized in that the resin layer (452, 852, 852', 1352, 1352', 2138) is formed such that a length (Le11, Le12) of a part of the resin layer (452, 852, 852', 1352, 1352', 2138) where the adjacent metal layer (450-1, 450-2, 650-1, 650-2, 650-3, 650-4, 850-1, 850-1', 850-2, 1350-1, 1350-2) is not formed, along the waveguide direction of the optical waveguide (244b-1, 2134) is longer than a wavelength (λ) of light propagating through the optical waveguide (244b-1, 2134). a substrate (230, 2130); an optical waveguide (244b-1, 2134) formed in the substrate (230, 2130); and an electrode for controlling light wave propagating through the optical waveguide (244b-1, 2134), wherein the optical waveguide (244b-1, 2134) and the electrode have an intersection (370, 770, 1270, 2140) in which the optical waveguide (244b-1, 2134) and the electrode intersect with each other, and at the intersection (370, 770, 1270, 2140), the electrode has a multilayer structure including a plurality of metal layers (450-1, 450-2, 650-1, 650-2, 650-3, 650-4, 850-1, 850-1', 850-2, 1350-1, 1350-2) made of a metal material, wherein a resin layer (452, 852, 852', 1352, 1352', 2138) made of a resin material is formed between the electrode and the substrate(230, 2130), wherein the resin layer (452, 852, 852', 1352, 1352', 2138) is formed across at least two intersections (370, 770, 1270, 2140), and the resin layer (452, 852, 852', 1352, 1352', 2138) is formed such that a length of the resin layer (452, 852, 852', 1352, 1352', 2138) along a waveguide direction of the optical waveguide (244b-1, 2134) is longer than a length of the metal layer (450-1, 450-2, 650-1, 650-2, 650-3, 650-4, 850-1, 850-1', 850-2, 1350-1, 1350-2) which is adjacent to the resin layer along the waveguide direction of the optical waveguide (244b-1, 2134), characterized in that the resin layer (452, 852, 852', 1352, 1352', 2138) is formed such that a length (Le11, Le12) of a part of the resin layer (452, 852, 852', 1352, 1352', 2138) where the adjacent metal layer (450-1, 450-2, 650-1, 650-2, 650-3, 650-4, 850-1, 850-1', 850-2, 1350-1, 1350-2) is not formed, along the waveguide direction of the optical waveguide (244b-1, 2134) is longer than a wavelength (λ) of light propagating through the optical waveguide (244b-1, 2134).