To provide a connection structure of an electric connector which can reduce a capacitance between connections to which terminals are connected respectively and which face each other, and to provide a circuit board for the connection structure.

The electric connector comprises a plurality of connections 5 which are formed and arranged in an end area 20 on both surfaces of an arrangement part in the shape of a plate located on a body to be connected 4, and a plurality of terminals 3 to be connected to a plurality of the connection parts 5, respectively. A pair of the connection parts 5 corresponding to each other on the both surfaces is short-circuited; the terminal has a pair of two contacts 14, 15 which fit to a correspondent pair of the connections 5 from the end area of the arrangement part, sandwich and press the correspondent pair of the connection parts 5 therebetween, and come into contact with the correspondent pair of the connection parts 5; the two contacts 14, 15 of each terminal 3 are located off from each other in an arrangement direction of the terminals; and the pair of the connection parts 5, also, of the body to be connected 4 are located off from each other corresponding to the contact parts 14, 15 of the terminal 3.