A wobble detection device comprising: a sensor unit that includes a first one-dimensional image sensor and a second one-dimensional image sensor (170, 270) arranged side by side in an auxiliary scanning direction (y) so that corresponding pixels of the first one-dimensional image sensor and the second one-dimensional image sensor coincide with each other in a main scanning direction (x), which is orthogonal to the auxiliary scanning direction, where the sensor unit is configured to acquire an image of an object moving in the auxiliary scanning direction (y) as one-dimensional data, wherein the sensor unit includes a third one-dimensional image sensor, the third one-dimensional image sensor is disposed between the first one-dimensional image sensor and the second one-dimensional image sensor so that the one-dimensional image sensors are arranged in the auxiliary scanning direction (y) and corresponding pixels of the one-dimensional image sensors coincide with each other in the main scanning direction (x), and the sensor unit is configured to acquire an image moving in the auxiliary scanning direction (y) as third one-dimensional data, the wobble detection device being configured to make a comparison of data corresponding to a same image region of the image by using first one-dimensional data acquired by the first one-dimensional image sensor and second one-dimensional data acquired by the second one-dimensional image sensor and being configured to thereby detect a movement amount, which is a wobble amount, of the image in the main scanning direction (x) between a time when the first one-dimensional data used for the comparison was acquired and a time when the second one-dimensional data used for the comparison was acquired, characterized in that the wobble detection device is configured to generate fourth one-dimensional data from the first one-dimensional data from the first one-dimensional image sensor and the third one-dimensional data from the third one-dimensional image sensor, to generate fifth one-dimensional data from the second one-dimensional data from the second one-dimensional image sensor and the third one-dimensional data from the third one-dimensional image sensor, and to make a comparison by using the fourth one-dimensional data and the fifth one-dimensional data corresponding to the same image region. a sensor unit that includes a first one-dimensional image sensor and a second one-dimensional image sensor (170, 270) arranged side by side in an auxiliary scanning direction (y) so that corresponding pixels of the first one-dimensional image sensor and the second one-dimensional image sensor coincide with each other in a main scanning direction (x), which is orthogonal to the auxiliary scanning direction, where the sensor unit is configured to acquire an image of an object moving in the auxiliary scanning direction (y) as one-dimensional data, wherein the sensor unit includes a third one-dimensional image sensor, the third one-dimensional image sensor is disposed between the first one-dimensional image sensor and the second one-dimensional image sensor so that the one-dimensional image sensors are arranged in the auxiliary scanning direction (y) and corresponding pixels of the one-dimensional image sensors coincide with each other in the main scanning direction (x), and the sensor unit is configured to acquire an image moving in the auxiliary scanning direction (y) as third one-dimensional data, the wobble detection device being configured to make a comparison of data corresponding to a same image region of the image by using first one-dimensional data acquired by the first one-dimensional image sensor and second one-dimensional data acquired by the second one-dimensional image sensor and being configured to thereby detect a movement amount, which is a wobble amount, of the image in the main scanning direction (x) between a time when the first one-dimensional data used for the comparison was acquired and a time when the second one-dimensional data used for the comparison was acquired, characterized in that the wobble detection device is configured to generate fourth one-dimensional data from the first one-dimensional data from the first one-dimensional image sensor and the third one-dimensional data from the third one-dimensional image sensor, to generate fifth one-dimensional data from the second one-dimensional data from the second one-dimensional image sensor and the third one-dimensional data from the third one-dimensional image sensor, and to make a comparison by using the fourth one-dimensional data and the fifth one-dimensional data corresponding to the same image region.