A multibeam scanning apparatus of an embodiment is a multibeam scanning apparatus configured to emit a plurality of electron beams to a plurality of scan regions set in a matrix on an object and obtain an observation image by detecting secondary beams, the apparatus including a control circuit. Each of the scan regions includes a plurality of separated scan regions obtained by separating the each of the scan regions in a direction orthogonal to a scanning direction of the electron beams. The control circuit controls the irradiation positions of the electron beams, in two of the scan regions adjacent to each other in the scanning direction of the electron beams, such that the separated scan regions to be scanned at a same time are displaced from each other by a predetermined distance in the direction orthogonal to the scanning direction of the electron beams.