A liquid ejection apparatus, comprising: a liquid ejection head unit (210K, 210C, 210M, 210Y) that is configured to eject liquid onto a conveyed object conveyed along a conveying path for conveying the conveyed object; a first support member (CR1K, CR1C, CR1M, CR1Y) that supports the conveyed object and is provided upstream of a landing position (PK, PC, PM, PY) of the liquid ejected onto the conveyed object by the liquid ejection head unit; a second support member (CR2K, CR2C, CR2M, CR2Y) that supports the conveyed object and is provided downstream of the landing position (PK, PC, PM, PY) of the liquid ejection head unit; one first detection unit (SENK, SENC, SENM, SENY), for the liquid ejection head unit (210K, 210C, 210M, 210Y), that is installed between the first support member and the second support member and is located upstream of and close to a landing position of the liquid ejection head unit (210; 210C, 210M, 210Y) and configured to detect a position of the conveyed object with respect to an orthogonal direction that is orthogonal to a conveying direction of the conveyed object; at least one second detection unit that is installed upstream of the first detection unit and is configured to detect the position of the conveyed object with respect to the orthogonal direction; and a movement control unit (110F20) that is configured to move the liquid ejection head unit in the orthogonal direction based on the movement amount of the conveyed object calculated by at least two detection results (S1, S2) selected from a plurality of detection results output by the first detection unit and the second detection unit; wherein the liquid ejection head unit (210K, 210C, 210M, 210Y) is disposed on one side of the conveyed object and the first detection unit (SENK, SENC, SENM, SENY) and the second detection unit are disposed on an opposite side of the conveyed object; and wherein the conveyed object is a web. a liquid ejection head unit (210K, 210C, 210M, 210Y) that is configured to eject liquid onto a conveyed object conveyed along a conveying path for conveying the conveyed object; a first support member (CR1K, CR1C, CR1M, CR1Y) that supports the conveyed object and is provided upstream of a landing position (PK, PC, PM, PY) of the liquid ejected onto the conveyed object by the liquid ejection head unit; a second support member (CR2K, CR2C, CR2M, CR2Y) that supports the conveyed object and is provided downstream of the landing position (PK, PC, PM, PY) of the liquid ejection head unit; one first detection unit (SENK, SENC, SENM, SENY), for the liquid ejection head unit (210K, 210C, 210M, 210Y), that is installed between the first support member and the second support member and is located upstream of and close to a landing position of the liquid ejection head unit (210; 210C, 210M, 210Y) and configured to detect a position of the conveyed object with respect to an orthogonal direction that is orthogonal to a conveying direction of the conveyed object; at least one second detection unit that is installed upstream of the first detection unit and is configured to detect the position of the conveyed object with respect to the orthogonal direction; and a movement control unit (110F20) that is configured to move the liquid ejection head unit in the orthogonal direction based on the movement amount of the conveyed object calculated by at least two detection results (S1, S2) selected from a plurality of detection results output by the first detection unit and the second detection unit; wherein the liquid ejection head unit (210K, 210C, 210M, 210Y) is disposed on one side of the conveyed object and the first detection unit (SENK, SENC, SENM, SENY) and the second detection unit are disposed on an opposite side of the conveyed object; and wherein the conveyed object is a web.