[Problem] To provide: a colorimetric sensor cell which has excellent sensing accuracy; a colorimetric sensor; a method for producing a colorimetric sensor cell; an SPR sensor cell; an SPR sensor; and a method for producing an SPR sensor cell.[Solution] A colorimetric sensor cell (1) which is provided with a sensing part (30) and a sample disposition part (31) that is adjacent to the sensing part (30). The sensing part (30) is provided with an optical waveguide which has an under cladding layer (3) that is formed of a first resin and a core layer (4) that is formed of a second resin and covered with the under cladding layer (3). A resin mixture layer (23), in which the first resin permeates into the second resin, is formed in the surface layer of the core layer (4), said surface layer being in contact with the under cladding layer (3). An SPR sensor cell (41) wherein: a sensing part (30) is provided with an optical waveguide which has an under cladding layer (3) that is formed of a first resin and a core layer (4) that is formed of a second resin and covered with the under cladding layer (3); and a resin mixture layer (23), in which the first resin permeates into the second resin, is formed in the surface layer of the core layer (4), said surface layer being in contact with the under cladding layer (3).
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