PROBLEM TO BE SOLVED: To provide a tumor treatment device capable of suppressing damage to normal cells other than an affected part. A tumor treatment apparatus according to the present invention includes a base, at least one electron-emitting device disposed on the base, and a power supply unit, and the electron-emitting device includes a lower electrode and a lower electrode. It comprises a surface electrode facing each other, and an intermediate layer arranged between the lower electrode and the surface electrode, and the base is provided so that the surface electrode can be opposed to an affected area via a gas phase. The power supply unit is provided so as to generate a potential difference between the lower electrode and the surface electrode, and is also provided so as to generate a potential difference between the surface electrode and the affected part. And [Selection diagram] Figure 1【課題】本発明は、患部以外の部分の正常な細胞にダメージを与えることを抑制することができる腫瘍治療装置を提供する。【解決手段】本発明の腫瘍治療装置は、基部と、前記基部上に配置された少なくとも１つの電子放出素子と、電源部とを備え、前記電子放出素子は、下部電極と、前記下部電極に対向する表面電極と、前記下部電極と前記表面電極との間に配置された中間層とを備え、前記基部は、前記表面電極を気相を介して患部と対向させることができるように設けられ、前記電源部は、前記下部電極と前記表面電極との間に電位差を生じさせるように設けられ、かつ、前記表面電極と前記患部との間に電位差を生じさせるように設けられたことを特徴とする。【選択図】図１
