At least one connection terminal (12) includes a contact portion (40) which is insertable in at least one receiving chamber (CV) of a connector housing (10), and a distal end portion (12a) which is electrically connectable to a conductive circuit pattern formed on a printed circuit board. A spacer block (14) is fittable to the connector housing (10), the spacer block (14) having a pair of upper and lower passage windows (24), which are disposed correspondingly to the at least one receiving chamber (CV) of the connector housing (10) and symmetrically with respect to a center axis (CL2) of the contact portion (40) received in the at least one receiving chamber (CV). The distal end portion (12a) of the at least one connection terminal (12) is passable through and retainable a position thereof at one of the upper and lower passage windows (24).