PROBLEM TO BE SOLVED: To provide a negative ion producing source without danger to human bodies and environment for general use at low cost, which does not require costly applied energy, produces negative ions by a phenomena close to a natural situation of producing negative ions, without need of a complex control device and without the risk of electric discharge and leakage； and to provide a production method.SOLUTION: Negative ions are produced by forming a coating film 1 comprising a ferroelectric material and an additive for assisting and enhancing the action of the ferroelectric material or an additive for solidifying a constituent material containing the ferroelectric material on the surface of a conductive base 2 having a projection/recess shape, connecting the conductive base to the earth or an antenna, continuously producing negative charge by electrical polarization caused in crystals of the ferromagnetic material placed in the coating film because of a variation of the input amount of kinetic and thermal energies of the object fluid, concentrating the negative ions on the surface of the coating film, and thereby giving electrons to the object fluid in contact with the surface of the coating film.【課題】有価の印加エネルギーを必要とせず、自然界におけるマイナスイオンの発生状況により近い現象でマイナスイオンが発生し、複雑な制御装置を必要とせず、放電や漏電の恐れがなく、人体や環境への危険性のない低コストで汎用的なマイナスイオン発生源及び発生方法を提供する。【解決手段】凹凸形状の導電性基材２の表面に強誘電性物質、及び該強誘電性物質の作用を補助し増強するための添加物、又は該強誘電性物質を含む構成物質を固化するための添加物からなる被膜１を形成し、導電性基材をアース又はアンテナと接続し、対象流体の運動エネルギー及び熱エネルギーの入力量の変化によって被膜内に配置された強誘電性物質の結晶に生じる電気分極による負の静電荷を連続的に発生させて被膜表面に集中させ、被膜表面に接触する対象流体に電子を付与することによってマイナスイオンを発生させる。【選択図】図３
