1. An image acquiring apparatus comprising: macro image acquiring means for acquiring a macro image of each of a plurality of samples; and control means including macro image acquisition control means for controlling an operation to acquire the macro image by the macro image acquiring means, and image pickup condition setting means for setting an image pickup condition for a micro image of the sample with reference to the macro image, wherein the control means includes session managing means for defining a session in accordance with a sample group consisting of the plurality of samples and managing a data group including data of the macro image and the image pickup condition for each of the samples as session data associated with the sample group for each session; and session switching means for controlling switching between the sessions in a state in which the sample group and the session data are associated with each other for each session, and wherein sample storage means for storing the plurality of samples is provided with an interlock mechanism that prevents the sample storage means from being opened during execution of the session; and the session switching means instructs the sample storage means to undo interlocking by the interlock mechanism when the session is paused or ended.