A liquid ejecting head comprising: a flow path portion that includes a first communication path which allows a liquid from a liquid holding unit (221, 222) to pass; a case member that includes a second communication path which communicates with the first communication path; and a seal member that is pinched between the case member and the flow path portion; a cover member (29, 62) into which a head chip for discharging the liquid from a nozzle communicating with the second communication path is set; wherein a predetermined space is formed in the case member and communicates with an opening formed on a recording medium side of the case member, wherein the cover member (29, 62) is configured to cover the opening in a state where the head chip is arranged in the predetermined space and the nozzle is exposed to an outside, wherein: the seal member allows the first communication path and the second communication path to be connected in a liquid-tight manner and seals the predetermined space on a case member side, the seal member divides the predetermined space from another space formed between the seal member and the flow path portion, and the seal member also seals the other space, the seal member is formed into a plate shape laminated with the flow path portion, the seal member has a continuous seal part having a greater thickness than the rest of the plate shape, the seal part being formed around a circumferential edge of the seal member, and characterized in that an upper surface of the seal part of the seal member has a groove-shaped path open to the atmosphere. a flow path portion that includes a first communication path which allows a liquid from a liquid holding unit (221, 222) to pass; a case member that includes a second communication path which communicates with the first communication path; and a seal member that is pinched between the case member and the flow path portion; a cover member (29, 62) into which a head chip for discharging the liquid from a nozzle communicating with the second communication path is set; wherein a predetermined space is formed in the case member and communicates with an opening formed on a recording medium side of the case member, wherein the cover member (29, 62) is configured to cover the opening in a state where the head chip is arranged in the predetermined space and the nozzle is exposed to an outside, wherein: the seal member allows the first communication path and the second communication path to be connected in a liquid-tight manner and seals the predetermined space on a case member side, the seal member divides the predetermined space from another space formed between the seal member and the flow path portion, and the seal member also seals the other space, the seal member is formed into a plate shape laminated with the flow path portion, the seal member has a continuous seal part having a greater thickness than the rest of the plate shape, the seal part being formed around a circumferential edge of the seal member, and characterized in that an upper surface of the seal part of the seal member has a groove-shaped path open to the atmosphere. the seal member allows the first communication path and the second communication path to be connected in a liquid-tight manner and seals the predetermined space on a case member side, the seal member divides the predetermined space from another space formed between the seal member and the flow path portion, and the seal member also seals the other space, the seal member is formed into a plate shape laminated with the flow path portion, the seal member has a continuous seal part having a greater thickness than the rest of the plate shape, the seal part being formed around a circumferential edge of the seal member, and characterized in that an upper surface of the seal part of the seal member has a groove-shaped path open to the atmosphere.