Provided is an ion-conducting material, comprising, as a composition in terms of mol%, 15 to 80% of P 2 O 5 , 0 to 70% of SiO 2 , and 5 to 35% of R 2 O, which represents the total content of Li 2 O, Na 2 O, K 2 O, Rb 2 O, Cs 2 O, and Ag 2 O.