BIOLOGICAL OBSERVATION APPARATUS

PROBLEM TO BE SOLVED: To provide a biological observation apparatus (endoscope device) 100 capable of easily distinguishing between a peripheral tissue such as a blood vessel and a bleeding site, and a tumor in the identification of a tumor by 5-ALA.SOLUTION: A biological observation apparatus includes a light source 11 for irradiating an excitation light near 405 nm onto a tissue, an optical sensor 3 for receiving a fluorescent light emitted from the tissue S onto which the excitation light is irradiated, and a first optical filter 41 installed on an optical path of the fluorescent light leading to the optical sensor 3 that cuts a light near 622 nm and transmits a light near 635 nm.SELECTED DRAWING: Figure 2 【課題】５−ＡＬＡによる腫瘍識別において、血管や出血等の周囲組織と、腫瘍とを容易に区別できる生体観測装置（内視鏡装置）１００を提供する。【解決手段】４０５ｎｍ付近の励起光を組織に照射する光源１１と、前記励起光を照射された組織Ｓから発される蛍光を受光する光センサ３と、前記光センサ３に至る蛍光の光路上に設けられて、６２２ｎｍ近傍の光をカットするとともに６３５ｎｍ近傍の光は透過させる第１光フィルタ４１とを備えるようにした。【選択図】図２