The instant disclosure provides an electronic thermometer including a shell unit, a circuit board, an electronic switch, an arm unit, and a probe unit. The shell unit has a pivot axis and a housing. The pivot axis is disposed on the external of the housing. The housing has a through hole. The circuit board is disposed in the housing. The electronic switch is electrically connected to the circuit board. The electronic switch includes a trigger end. The trigger end is exposed from the housing through the through hole. The arm unit has rotating base, a notch, and a pivot portion. The rotating base is pivotally disposed on the pivot axis through the pivot portion, for reciprocately rotating the rotating base along the pivot axis and between a first portion and a second position relative to the shell unit. The probe unit is disposed on the arm unit and electrically connected to the circuit board.本發明揭示一種電子溫度計,其包括一殼體單元、一電路基板、一電子開關、一旋臂單元及一探棒單元。殼體單元具有一樞轉軸及一容置殼體,樞轉軸設置於容置殼體的外部,容置殼體具有一貫穿孔。電路基板設置於容置殼體內。電子開關電性連接於電路基板,電子開關包括一觸發端,觸發端通過貫穿孔以凸出於容置殼體外。旋臂單元具有一旋轉座、一凹槽及一樞轉部,旋轉座通過樞轉部樞接於樞轉軸上,以使旋轉座沿著樞轉軸且相對於殼體單元於一第一位置及一第二位置之間往復轉動。探棒單元設置於旋臂單元上,探棒單元電性連接於電路基板。E‧‧‧電子溫度計1‧‧‧殼體單元11‧‧‧樞轉軸12‧‧‧容置殼體121‧‧‧貫穿孔13‧‧‧上蓋殼體14‧‧‧下蓋殼體15‧‧‧防水環16‧‧‧孔洞17‧‧‧電池蓋體171‧‧‧蓋體防水環2‧‧‧電路基板3‧‧‧電子開關31‧‧‧觸發端4‧‧‧旋臂單元41‧‧‧旋轉座411‧‧‧抵接面412‧‧‧開槽42‧‧‧凹槽43‧‧‧樞轉部5‧‧‧探棒單元51‧‧‧探針6‧‧‧防水單元D‧‧‧顯示模組S‧‧‧鎖固件H‧‧‧鎖固孔R‧‧‧橡塞C‧‧‧電池
