based on operation signals inputted through the operation panel 50 d in the control circuit 50 but also operate based on operation signals inputted from an external appliance for example computer 70 connected to the interface i f 50 f referring now to fig5 a modification of the recording head 26 u2032 of the one embodiment of the present invention described above with reference to fig1 through fig3 will be explained the recording head 26 u2033 of the modification is different from the recording head 26 u2032 of the one embodiment in the structure of each of the two ink jet sub units 26 u2032 k 1 26 u2032 k 2 for black ink each of the two ink jet sub units 26 u2032 k 1 26 u2032 k 2 of the recording head 26 u2033 of the modification has a plurality of sets each set comprising two sections 27 each of which has a large number of ink jet nozzles 27 a arranged along the direction intersecting the rotation direction r with a predetermined distance therebetween and in each of the sets two sections 27 are connected each other in such a manner that the large number of ink jet nozzles 27 a of one section 27 are displaced in the direction intersecting the rotation direction r by u00bd pz with respect to the large number of ink jet nozzles 27 a of the other section 27 in addition the two ink jet sub units 26 u2032 k 1 26 u2032 k 2 are combined each other in such a manner that the plurality of sets of sections 27 of one ink jet sub unit.