A charged particle beam irradiator makes it possible to observe an image at a high resolution and preferable contrast while reserving an operating distance of a sample or an area for the installation of a sample stage. The boom arm is extendible via an extension accessory kit. In a case where the developer cannot be made print-ready by the agitation operation, a density control operation for adjusting operating conditions of an apparatus is performed. Paylines are created from a plurality of the display segments, where the subsegment symbols of the display subsegments are independently used in formulating payout results for paylines in which the display segment is affiliated.