CAPACITANCE DETECTION DEVICE

To simplify and down-size the structure of a capacitance detection device or an image reading device having the capacitance detection device.SOLUTION: The capacitance detection device includes: a first electrode 1 and a second electrode 2 at least partly opposed, a conveyance path 5 along a conveyance direction which is a direction in which a sheet-like detection object 3 is conveyed being interposed between the first electrode 1 and the second electrode 2; an oscillation circuit that causes an electric field 9 to be formed between the first electrode 1 and the second electrode 2; a detection circuit that detects a change in capacitance between the first electrode 1 and the second electrode 2; a first substrate 11 and a second substrate 12 on which at least one of the oscillation circuit and the detection circuit is formed; an insulative first flat plate 6 formed between the first electrode 1 and the conveyance path 5; and an insulative second flat plate 7 formed between the second electrode 2 and the conveyance path 5.SELECTED DRAWING: Figure 25 【課題】 静電容量検出装置又は静電容量検出装置を有する画像読取装置の構造の簡易化及び小型化を目的とする。【解決手段】 シート状の検出対象物３が搬送される方向である搬送方向に沿った搬送路５を挟んで、少なくとも一部が対向する第１電極１及び第２電極２と、第１電極１と第２電極２との間に電界９を形成させる発振回路と、第１電極１と第２電極２との間の静電容量の変化を検出する検出回路と、発振回路及び検出回路の少なくとも一方が形成された第１基板１１及び第２基板１２と、第１電極１と搬送路５との間に形成された絶縁性の第１平板６と、第２電極２と搬送路５との間に形成された絶縁性の第２平板７とを備える。【選択図】図２５