Terminal block and terminal block manufacturing method

A terminal block in which conductors extending from devices are to be placed one over another and fastened by a bolt, comprising:

• at least one nut having a first surface on which the conductors are to be placed, a second surface opposite the first surface and a bolt tightening hole extending between the first and second surfaces;
• an insulating plate with a nut accommodating portion having a bottom panel closely contacting the second surface of the nut, at least one surrounding wall standing up from the bottom panel and at least partly surrounding side surfaces of the nut for positioning the nut in the nut accommodating portion and a hollow bolt escape receptacle with a concave side aligned coaxially with the bolt tightening hole and a convex side projecting away from the nut;
• a heat sink closely contacting a surface of the bottom panel of the insulating plate opposite the nut, an accommodation recess in the heat sink engaging the convex side of the bolt escape receptacle;
• and
• a unitary matrix of synthetic resin surrounding at least parts of the nut, the insulating plate and the heat sink and holding the nut, the insulating plate and the heat sink in an assembled condition.