An electrical connector (jack 10) moutable on a circuit board, the electrical connector comprising: a plurality of contact pins to be connected to respective contacts of a mating connector; an insulating housing including the plurality of contact pins (110-1, 110-2) spaced at a predetermined spacing from each other; and a shield case covering the insulating housing, characterized in that at least one contact pin of the plurality of contact pins comprises a projecting part projecting toward another adjacent contact pin such that a spacing between the at least one contact pin and the another contact pin is smaller than the predetermined spacing, wherein: each contact pin (110-1, 110-2) of the plurality of contact pins includes: a first elongated part comprising a contact part formed on one end of the first elongated part, the contact part connecting to a mating contact; and a second elongated part comprising a terminal part extending from the other end of the first elongated part in a direction orthogonal to an extending direction of the first elongated part, the terminal part to be connected to a circuit board; the second elongated parts of the contact pins (110-1, 110-2) adjacent to each other in the plurality of contact pins are spaced at the predetermined spacing in the extending direction of the first elongated part; the shield case includes: a cuboid-shaped covering part (base covering part 162) surrounding the second elongated part; characterized in that the shield case further includes a cylindrical covering part surrounding the first elongated part and in that the projecting part (120-1,120-2) projects toward the respective opposing second elongated part in the extending direction of the first elongated part and the projecting part projects from a portion of the second elongated part within the cuboid-shaped covering part, the projecting part extending from an upper end to a lower end of the second elongated part, the lower end excluding the terminal end. each contact pin (110-1, 110-2) of the plurality of contact pins includes: a first elongated part comprising a contact part formed on one end of the first elongated part, the contact part connecting to a mating contact; and a second elongated part comprising a terminal part extending from the other end of the first elongated part in a direction orthogonal to an extending direction of the first elongated part, the terminal part to be connected to a circuit board; a first elongated part comprising a contact part formed on one end of the first elongated part, the contact part connecting to a mating contact; and a second elongated part comprising a terminal part extending from the other end of the first elongated part in a direction orthogonal to an extending direction of the first elongated part, the terminal part to be connected to a circuit board; the second elongated parts of the contact pins (110-1, 110-2) adjacent to each other in the plurality of contact pins are spaced at the predetermined spacing in the extending direction of the first elongated part; the shield case includes: a cuboid-shaped covering part (base covering part 162) surrounding the second elongated part; characterized in that the shield case further includes a cylindrical covering part surrounding the first elongated part and in that the projecting part (120-1,120-2) projects toward the respective opposing second elongated part in the extending direction of the first elongated part and the projecting part projects from a portion of the second elongated part within the cuboid-shaped covering part, the projecting part extending from an upper end to a lower end of the second elongated part, the lower end excluding the terminal end.