The object of present invention is to provide an internal moisture meter comprising: a detecting portion for detecting the moistures of subjects a display portion for displaying the detected moisture of present time a maintain portion for maintaining the detected moisture as detection information. Furthermore, according to the moisture detected at present time, the internal moisture meter shall judge the subject is in dehydrated state or non-dehydrated state, and, by the detection information to be the dehydrated state of former as result of judgement kept in said detecting portion, together with the present moisture and the detection result of present time, a display state of display portion is changed.本發明之目的在於提供一體內水分計,其係具備:測定受檢者水分量之測定部;顯示根據測定部所測定之本次水分量之顯示部;將本次水分量作為測定資訊保持的保持部。體內水分計更進一步依照本次水分量,判斷受檢者為脫水狀態或非脫水狀態,根據保持於保持部之上次測定資訊所得之上次水分量及是否為脫水狀態等上次的判定結果,和上述本次水分量及上述判定裝置進行之本次判定結果,變更顯示部之顯示形態。100‧‧‧體內水分計101‧‧‧本體部102‧‧‧電源開關103‧‧‧顯示部1031‧‧‧本次水分量測定結果1032‧‧‧上次水分量測定結果1033‧‧‧電池顯示部110‧‧‧感應器1101a、1101b‧‧‧箭頭方向111‧‧‧感應頭
