PROBLEM TO BE SOLVED: To appropriately execute imaging of a reference mark in accordance with deformation amounts of drive parts that drive a head unit in different directions.;SOLUTION: A reference mark imaging method includes the steps of: executing a first imaging operation in which reference marks including two reference marks that are disposed at different positions in a first direction among N pieces of reference marks, and being less than the N pieces are imaged by an imaging part; and executing a second imaging operation in which reference marks including two reference marks that are disposed at different positions in a second direction being orthogonal to the first direction, among the N pieces of reference marks and being less than the N pieces are imaged by the imaging part. A deformation amount of a first drive part that drives a head unit in the first direction with the passage of time is greater than a deformation amount of a second drive part that drives the head unit in the second direction, with the passage of time. The first imaging operation is executed in a higher frequency than a frequency in which the second imaging operation is executed.;SELECTED DRAWING: Figure 4;COPYRIGHT: (C)2018,JPO&INPIT
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