Connecting member

The invention concerns a connecting member (10) made of a resin composition, the connecting member having one end face (11) in which a plurality of fine holes (12) are spaced by a pitch P therebetween to form an array in one horizontal row or a plurality of horizontal rows with a vertical distance (h) therebetween, wherein: a diameter of the fine holes is given by a, a row-to-row distance of the fine holes is given by h which is, however, zero when the number of the rows of the fine holes is one, a diameter of the guide pin insertion holes is given by b, the pitch between the fine holes is given by P, a space formed between each one of the guide pin insertion holes and nearest one of the fine holes is given by x, a center-to-center horizontal distance between each one of the guide pin insertion holes and the nearest one of the fine holes is given by L1, wherein: the following formula is met; 1 < (x / (P - a)) < 10, in which x is given by x = (L1 2 + (h/2) 2 ) 0.5 - a/2 - b/2.