A detection device comprising: (i) a flow channel provided on a substrate formed of resin and transporting a liquid sample from one end side to the other end side; (ii) a solid-phase part provided on the other end side of the flow channel, in which an antibody is set to a solid-phase; (iii) a detection unit provided with an electrode portion to detect a reaction of the liquid sample with respect to the antibody; (iv) a fine uneven structure having a plurality of protrusions formed integrally with the flow channel, wherein the fine uneven structure has a first uneven portion in which the plurality of protrusions are provided relatively loosely, a second uneven portion in which the plurality of protrusions are provided relatively densely, and the first uneven portion and second uneven portion are provided further toward the one end side of the flow channel than the solid-phase part; and (v) an introduction portion for introducing the liquid sample into the flow channel, wherein the liquid sample is formed of a plurality of types of solutions, and the introduction portion is provided at a plurality of locations according to the plurality of types of solutions; the detection unit is provided further toward the other end side of the flow channel than the solid-phase part; and wherein the first uneven portion and the second uneven portion are adjacent, a ratio (P1/P2) of a pitch (P1) between the protrusions in the first uneven portion and a pitch (P2) between the protrusions in the second uneven portion is 1.1 or more and 5 or less. (i) a flow channel provided on a substrate formed of resin and transporting a liquid sample from one end side to the other end side; (ii) a solid-phase part provided on the other end side of the flow channel, in which an antibody is set to a solid-phase; (iii) a detection unit provided with an electrode portion to detect a reaction of the liquid sample with respect to the antibody; (iv) a fine uneven structure having a plurality of protrusions formed integrally with the flow channel, wherein the fine uneven structure has a first uneven portion in which the plurality of protrusions are provided relatively loosely, a second uneven portion in which the plurality of protrusions are provided relatively densely, and the first uneven portion and second uneven portion are provided further toward the one end side of the flow channel than the solid-phase part; and (v) an introduction portion for introducing the liquid sample into the flow channel, wherein the liquid sample is formed of a plurality of types of solutions, and the introduction portion is provided at a plurality of locations according to the plurality of types of solutions; the detection unit is provided further toward the other end side of the flow channel than the solid-phase part; and wherein the first uneven portion and the second uneven portion are adjacent, a ratio (P1/P2) of a pitch (P1) between the protrusions in the first uneven portion and a pitch (P2) between the protrusions in the second uneven portion is 1.1 or more and 5 or less. wherein the liquid sample is formed of a plurality of types of solutions, and the introduction portion is provided at a plurality of locations according to the plurality of types of solutions; the detection unit is provided further toward the other end side of the flow channel than the solid-phase part; and wherein the first uneven portion and the second uneven portion are adjacent, a ratio (P1/P2) of a pitch (P1) between the protrusions in the first uneven portion and a pitch (P2) between the protrusions in the second uneven portion is 1.1 or more and 5 or less. <EOS>