Abstract: A jumper connector (15) for making an electric connection between contact pins or posts (14) that protrude from a printed circuit board (11) has a recipient core (16) made of a conductive elastomer. The jumper connector further has parallel bores (17) formed through the recipient core so as tightly fit on the two contact pins (15). An insulating mantle (18) is integrally secured to and covers the outer periphery of the recipient core. One or two finger tabs (19) extend in the longitudinal direction of the insulating mantle (18), and a guide (30) is formed in or on the bottom of the recipient core so that the contacts pins (14) are guided to take a correct position relative to the parallel bores (17) of the jumper connector, which enables a high density array of contact pins, is easily mountable on and dismountable from a printed circuit board and is of such a simple structure as reducing manufacture cost.