PURPOSE: To obtain an irradiation device capable of executing photographing from the upper part of the surface of a sample, and excellent in uniformity.

CONSTITUTION: This reflection type uniform irradiation device is constituted so that respective left and right socket holders 3 and 3 are erected from the respective left and right edge parts of the surface of the flat square sample 6, the front and the rear end parts of plural straight tube type lamps 1 is supported by the plural pairs of sockets 2a and 2b consisting of front and rear ones. provided at the front and the back edge parts of the respective holders 3 and 3 and front and rear reflection plates 5a and 5b are erected respectively from the front and the rear edge parts of the surface of the sample 6.