A printing device comprising a fluid ejection device adapted to eject a fluid contained in a containing chamber from an ejection port provided to the containing chamber, the fluid ejection device comprising: a valving element adapted to reciprocate in the containing chamber toward the ejection port to thereby push the fluid out from the ejection port, and then block the ejection port with a tip part, wherein the containing chamber is provided with a communication port, which is adapted to accept the fluid pressure-fed from a supply section, disposed at a position separated from the ejection port in a direction from the ejection port toward the valving element, the device is configured such that the valving element stops at a predetermined stopping position when ejection of the fluid from the ejection port is not performed, and in a case in which the valving element is located at the stopping position, an internal space of the containing chamber is divided by a boundary part, which is formed by a part of the valving element and a part of the containing chamber having contact with each other, into a first space including a part of a space between the ejection port and the communication port, and a second space in which the communication port opens, and in a case in which the valving element is displaced from the stopping position, the division by the boundary part is released to make the first space and the second space communicate with each other, characterised in that the stopping position is a position where the tip part of the valving element blocks the ejection port, the valving element has a valving element flaring part (30A-E), which is located in a region on a back-end part side of a contact region having contact with a circumferential edge part of the ejection port when blocking the ejection port, and flares to outside of the contact region throughout an outer circumference of the valving element when viewing the valving element from the tip part side along a direction of the reciprocation, an inner wall surface of the containing chamber includes a containing chamber flaring part (31A-E), which is located between the communication port and the ejection port in the direction of the reciprocation, and surrounds the ejection port and narrows toward the ejection port to a position overlapping the valving element flaring part when viewed from the back-end part side of the valving element along the direction of the reciprocation, the valving element flaring part and the containing chamber flaring part have contact with each other to form the boundary part in a case in which the valving element is located at the stopping position, and a resin member adapted to form a sealing line in the boundary part is provided to at least one of the valving element flaring part and the containing chamber flaring part. a valving element adapted to reciprocate in the containing chamber toward the ejection port to thereby push the fluid out from the ejection port, and then block the ejection port with a tip part, wherein the containing chamber is provided with a communication port, which is adapted to accept the fluid pressure-fed from a supply section, disposed at a position separated from the ejection port in a direction from the ejection port toward the valving element, the device is configured such that the valving element stops at a predetermined stopping position when ejection of the fluid from the ejection port is not performed, and in a case in which the valving element is located at the stopping position, an internal space of the containing chamber is divided by a boundary part, which is formed by a part of the valving element and a part of the containing chamber having contact with each other, into a first space including a part of a space between the ejection port and the communication port, and a second space in which the communication port opens, and in a case in which the valving element is displaced from the stopping position, the division by the boundary part is released to make the first space and the second space communicate with each other, characterised in that the stopping position is a position where the tip part of the valving element blocks the ejection port, the valving element has a valving element flaring part (30A-E), which is located in a region on a back-end part side of a contact region having contact with a circumferential edge part of the ejection port when blocking the ejection port, and flares to outside of the contact region throughout an outer circumference of the valving element when viewing the valving element from the tip part side along a direction of the reciprocation, an inner wall surface of the containing chamber includes a containing chamber flaring part (31A-E), which is located between the communication port and the ejection port in the direction of the reciprocation, and surrounds the ejection port and narrows toward the ejection port to a position overlapping the valving element flaring part when viewed from the back-end part side of the valving element along the direction of the reciprocation, the valving element flaring part and the containing chamber flaring part have contact with each other to form the boundary part in a case in which the valving element is located at the stopping position, and a resin member adapted to form a sealing line in the boundary part is provided to at least one of the valving element flaring part and the containing chamber flaring part.