Patent ID: 7903327

Claim:
A fluorescence microscope apparatus comprising: a stage configured to mount a specimen; an objective lens having an optical axis, the objective lens being configured to collect fluorescence from the specimen; a moving mechanism configured to relatively move the objective lens with respect to the stage in a direction orthogonal to the optical axis; a first cover member secured to the objective lens; a second cover member, provided at the stage side and configured to enclose, together with the first cover member, a tip of the objective lens and a space above the stage; and a light-blocking member configured to allow the relative movement in a direction orthogonal to the optical axis of the first and second cover members and to prevent leakage of light from a gap between the two cover members, wherein the light-blocking member is constituted by the first cover member and the second cover member, in which the second cover member overlaps the first cover member in a direction parallel to the optical axis of the first cover member, with a minute gap provided in the direction orthogonal to the optical axis therebetween.