A method of measuring a shutter time lag comprising: a first step in which j (j is a natural number, and 1 < j < i) display elements are brought into a first display state on a display unit including i (i is a natural number greater than 2) display elements, and (i - j) display elements other than j display elements in the first display state are brought into a second display state observed as being darker than the first display state, and thereby among a plurality of different types of display patterns, an m-th (m is a natural number greater than or equal to one) display pattern is formed by i display elements, and when a pattern continuation time T P has elapsed from the display of the m-th display pattern, k (k is a natural number, and 0 < k < j) display elements are brought into the second display state among j display elements in the first display state in the m-th display pattern, and k display elements are brought into the first display state among (i - j) display elements in the second display state in the m-th display pattern, and thereby a switching operation of switching i display elements in an (m + 1)-th display pattern is sequentially executed, wherein the switching operation comprises switching between a plurality of different display patterns in a predetermined sequence; a second step in which a camera captures an image of the display unit that sequentially executes the switching operation, in response to a shutter operation of the camera performed in synchronization with the switching operation, the camera being a target for measurement, wherein the predetermined sequence of display patterns of the switching operation is started in synchronization with the shutter operation; a third step in which a shutter time lag taken from the shutter operation to the imaging of the display unit is deduced from the image captured by the camera; and a preparation step of setting i, j, k, and T P prior to the first step, characterised in that, when a predetermined time T is the shortest time required for the camera to imprint an image of the display elements in the second step, at least one of T P, j, and k is set in such a manner that T P j/k is greater than or equal to T, and T P is shorter than a shutter speed of the camera. a first step in which j (j is a natural number, and 1 < j < i) display elements are brought into a first display state on a display unit including i (i is a natural number greater than 2) display elements, and (i - j) display elements other than j display elements in the first display state are brought into a second display state observed as being darker than the first display state, and thereby among a plurality of different types of display patterns, an m-th (m is a natural number greater than or equal to one) display pattern is formed by i display elements, and when a pattern continuation time T P has elapsed from the display of the m-th display pattern, k (k is a natural number, and 0 < k < j) display elements are brought into the second display state among j display elements in the first display state in the m-th display pattern, and k display elements are brought into the first display state among (i - j) display elements in the second display state in the m-th display pattern, and thereby a switching operation of switching i display elements in an (m + 1)-th display pattern is sequentially executed, wherein the switching operation comprises switching between a plurality of different display patterns in a predetermined sequence; a second step in which a camera captures an image of the display unit that sequentially executes the switching operation, in response to a shutter operation of the camera performed in synchronization with the switching operation, the camera being a target for measurement, wherein the predetermined sequence of display patterns of the switching operation is started in synchronization with the shutter operation; a third step in which a shutter time lag taken from the shutter operation to the imaging of the display unit is deduced from the image captured by the camera; and a preparation step of setting i, j, k, and T P prior to the first step, characterised in that, when a predetermined time T is the shortest time required for the camera to imprint an image of the display elements in the second step, at least one of T P, j, and k is set in such a manner that T P j/k is greater than or equal to T, and T P is shorter than a shutter speed of the camera.