addition when the ink is discharged to the second surface 39 through the small through holes 53 the discharged positions are arranged in the zigzag thereby facilitating the drying of the ink in this embodiment a tapered portion 55 inclined to become apart from the contact terminal 47 of the second contact arm 43 is formed in a portion of the base portion facing the contact terminal 47 of the second contact arm 43 the tapered portion 55 extends successively from the small through hole 53 accordingly since the ink k guided into the second surface 39 through the small through hole 53 is guided along the surface of the tapered portion 55 in a direction apart from the second contact arm 43 and the contact terminal 47 there of as shown in fig6 and 7 the possibility that the second contact arm 43 and the contact terminal 47 come in contact with the ink k becomes very small departure preventing protrusions 57 are formed on both side surfaces of the housing 31 at positions substantially corresponding to the contact terminals 45 and 47 so as not to cause the connector 11 to depart in a direction parallel to the plane of the main body side substrate 9 the positional departure of the housing 31 is prevented by the protrusions 57 next a structure for bringing the contact terminals 45 and 47 into reliable contact with the conductive connection portions 10 of the cartridge side substrate 15 and the conductive connection portions 12 of the main body side substrate 9 will be described when the ink cartridge 5 is correctly set into the cartridge receiving section 7 as shown in fig1 the locking portion 23 of the lock lever 17 engages with the locking protrusion 29 and the contact.