An ion conductor structural body having a high ion conductivity and an excellent mechanical strength, principally comprising is provided. This ion conductor structural body includes (a) a polymer matrix; (b) a solvent capable of functioning as a plasticizer; and (c) an electrolyte. The polymer matrix (a) includes a polymer chain having at least a segment represented by the following general formula (1), a main chain portion of said polymer chain and a side chain portion of said segment have an orientation property, and said polymer matrix has a crosslinked structure: ##STR00001## wherein R.sup.1 and R.sup.2 are, respectively, H or an alkyl group of 2 or less carbon atoms, A is a group having at least a polyether group, and R.sup.3 is a group having at least an alkyl group of more than 6 carbon atoms.