A detection device includes: an expanding and contracting base having elasticity; a first base which is provided to overlap the expanding and contracting base, has a Young's modulus higher than that of the expanding and contracting base, and includes a connection portion to which a sensing section is connectable; a second base which is provided on a side of the expanding and contracting base opposite to the first base, and has a Young's modulus higher than that of the expanding and contracting base; a connection member which electrically connects the expanding and contracting base and the first base to each other; and a mold portion which is provided to come into contact with the connection member, has a Young's modulus higher than that of the expanding and contracting base, and has a Young's modulus lower than that of the first base.