A head chip configured to jet a liquid comprising: an actuator plate formed of a piezoelectric material and having a plurality of ejection grooves (C1e); and a nozzle plate having a plurality of nozzle holes individually communicated with the plurality of ejection grooves (C1e), wherein the plurality of ejection grooves (C1e) is arranged side by side so as to at least partially overlap each other along a predetermined direction, the nozzle holes adjacent to each other along the predetermined direction of the plurality of nozzle holes are arranged so as to be shifted from each other along an extending direction of the ejection grooves (C1e) in the nozzle plate; and the head chip, further comprises a cover plate having a plurality of first through holes configured to make the liquid inflow into the ejection grooves, a plurality of second through holes (Sout1) configured to make the liquid outflow from the ejection grooves, and a wall part configured to cover the ejection grooves, wherein a plurality of through hole pairs are each constituted by a first through hole and a second through hole (Sout1), each through hole pairs being arranged along the extending direction of the ejection groove, a length of the wall part along the extending direction of the ejection grooves corresponding to a distance between the first through hole and the second through hole (Sout1) in the through hole pairs is made the same in all of the through hole pairs, and a magnitude relationship between a first opening length, as a length of the first through holes along the extending direction of the ejection groove and, a second opening length (Lout2), as a length of the second through holes (Sout1) along the extending direction of the ejection grooves is alternated between the first opening length being greater than the second opening length (Lout1) and the first opening length being less than the second opening length (Lout1) between the through hole pairs adjacent to each other along the predetermined direction. an actuator plate formed of a piezoelectric material and having a plurality of ejection grooves (C1e); and a nozzle plate having a plurality of nozzle holes individually communicated with the plurality of ejection grooves (C1e), wherein the plurality of ejection grooves (C1e) is arranged side by side so as to at least partially overlap each other along a predetermined direction, the nozzle holes adjacent to each other along the predetermined direction of the plurality of nozzle holes are arranged so as to be shifted from each other along an extending direction of the ejection grooves (C1e) in the nozzle plate; and the head chip, further comprises a cover plate having a plurality of first through holes configured to make the liquid inflow into the ejection grooves, a plurality of second through holes (Sout1) configured to make the liquid outflow from the ejection grooves, and a wall part configured to cover the ejection grooves, wherein a plurality of through hole pairs are each constituted by a first through hole and a second through hole (Sout1), each through hole pairs being arranged along the extending direction of the ejection groove, a length of the wall part along the extending direction of the ejection grooves corresponding to a distance between the first through hole and the second through hole (Sout1) in the through hole pairs is made the same in all of the through hole pairs, and a magnitude relationship between a first opening length, as a length of the first through holes along the extending direction of the ejection groove and, a second opening length (Lout2), as a length of the second through holes (Sout1) along the extending direction of the ejection grooves is alternated between the first opening length being greater than the second opening length (Lout1) and the first opening length being less than the second opening length (Lout1) between the through hole pairs adjacent to each other along the predetermined direction.