An electrostatic capacitance fluid level sensor includes a hermetic terminal having two terminal pins inserted through a metal base, a detection device including two electrodes for fluid level detection by electrostatic capacitance and two connecting terminals configured to fix the pins to the electrodes respectively. The connecting terminals are formed into such a shape as to include parts parallel to the electrodes and parts orthogonal to the electrodes by bending the terminals at bends, respectively. The parallel parts are fixed to sides of the electrodes opposed to sides of the electrodes facing each other, respectively. The orthogonal parts are fixed to the pins respectively. One of the terminals has a larger thickness than the other thereby to have a sufficient stiffness to hold the detection device. At least one of the terminals is deformable by a weaker force than a force causing the electrodes to deform.