An electrical impedance measuring apparatus includes: a plurality of electrodes adhered to a periphery of a chest of a living body a potential measurer configured to perform a process of applying a current to any ones of the electrodes, and measuring potentials by means of other electrodes an impedance acquirer, based on the applied current and the potentials obtained by the potential measurer, configured to obtain information related to an impedance of each of meshes, a chest section divided into the meshes and an average value calculator configured to obtain a whole-region average value of impedances of all meshes of the chest section, and configured to obtain an ROI average value of impedances of meshes contained in each of ROIs, a whole region of the chest section segmented into the ROIs.
