A signal detection device according to an aspect of the present invention includes: a first circuit layer (201) in which a plurality of electrodes in contact with a subject are formed； and a plurality of amplifiers each having an input unit capacitively coupled to each of the plurality of electrodes. The formed second circuit layer (202) and the third circuit layer (203) in which a plurality of transistors for reading out the outputs of the plurality of amplifiers are stacked, and the first circuit layer includes An insulating layer that seals the second circuit layer is formed between the plurality of formed electrodes and the second circuit layer, and the inputs of the plurality of electrodes and the plurality of amplifiers are interposed through the insulating layer. Are capacitively coupled to each other.本発明の一態様による信号検出装置は、被検体と接する複数の電極が形成された第１回路層（２０１）と、前記複数の電極のそれぞれと容量結合された入力部を有する複数の増幅器が形成された第２回路層（２０２）と、前記複数の増幅器の出力を読み出すための複数のトランジスタが形成された第３回路層（２０３）と、を積層して備え、前記第１回路層に形成された前記複数の電極と前記第２回路層との間に、前記第２回路層を封止する絶縁層が形成され、その絶縁層を介して前記複数の電極と前記複数の増幅器の入力部とが容量結合されている。
