Patent ID: 7552639

Claim:
A quartz sensor used for detecting an object to be measured in a sample solution, comprising: a circuit board equipped with a connecting terminal unit which is configured to connect to a measuring device main unit and electrodes electronically connected to the connecting terminal unit; a quartz holding member holding made an elastic material provided with a recess for forming an airtight space, and stacked above said circuit board; a quartz resonator formed of a quartz piece equipped with excitation electrodes which are arranged on one surface side and on another surface side of the quartz piece respectively and are electrically connected to the electrodes of said circuit board, and said quartz resonator being held by said quartz holding member in a state that the excitation electrode on the another surface side covers the recess so as to face said recess; an adsorbing layer provided on the excitation electrode on said one surface side, and said adsorbing layer having a capacity for adsorbing the object to he measured in the sample solution; a lid closely contacting with a periphery of said recess in said quartz holding member, and forming a pouring space for the sample solution by enclosing an upper space on said one surface side of said quartz resonator; said lid including an outer surface defining a pouring opening for the sample solution and a confirmation opening for confirming that the sample solution is poured into the pouring space, wherein said pouring opening and said confirmation opening are connected in an inside or the lid to said pouring space, and a conductive adhesive connecting the excitation electrode of said quartz resonator and the electrode of said circuit board, wherein a natural frequency of the quartz resonator varies by adsorption of the object to he measured on said adsorbing layer.