Abstract: An object of the invention is to provide a component concentration measuring apparatus by blood sampling by laser perforating, capable of preventing leak of an abnormal odor generated during laser perforating, and improving user's convenience. In a component concentration measuring apparatus of the invention, a slide sheet 6 in which a film is provided on the optical axis of a laser beam, and an insertion holder 7 the inside of which is hollow are inserted into a main body 2 equipped with a laser device, a focusing lens, an analyzing device that analyzes components of a body fluid by an enzyme reaction of a specimen reagent, a laser operation button 5, a display 3, a display switching button 4, a chargeable battery, and an electric circuit on which a memory that stores the operation of the laser device, analysis of component concentration by the output of the analyzing device, and analysis results is mounted.

Abstract: The present invention relates to a filter for filtering a blood sample containing a blood cell component, which comprises a main body which defines a channel for causing the blood sample to flow, an opening for introducing the blood sample, the opening being located at one end of the channel, and an opening for discharging the blood sample filtered through the channel, the opening being located at the other end of the channel. A plurality of structures are disposed in the channel to prevent the blood cell component from passing through the channel. The structures are disposed at intervals such that a slit through which the blood cell component cannot pass is formed between each structure and an adjacent inner wall of the channel and between adjacent structures. The plurality of structures and the inner wall of the channel define at least one cavity functioning as a blood cell reservoir for accommodating the blood cell component in the channel.