To provide the safe electrolyte having excellent heat resistance without generating corrosion and danger.

This ion conductive high polymer electrolyte is composed of lithium salt of the organic boron complex compound expressed with a formula (in the formula, R1 means a hydrogen atom, an alkyl group having 1-4 carbon, a substituent or non-substituent benzene ring and a naphthalene ring, and R2 means a substituent or non-substituent benzene ring and naphthalene ring.) and the organic high polymer having polyether segment in a main chain or a side chain thereof. In the case of the organic high polymer having polyether segment in the side chain, mole fraction at the minimum unit of repetition of polyether segment is set at 0.2-0.8.