NOVELTY - An alkali metal-sulfur-type secondary battery (50) comprises positive electrode (2) or negative electrode (4) comprising sulfur-type electrode active material, electrolyte solution containing glyme excluding tetraglyme (I), and alkali metal salt, and counter electrode of positive electrode or negative electrode. The molar ratio of alkali metal salt with respect to the glyme is 0.5-2, and portion(s) of glyme and the alkali metal salt forms complex. The discharge capacity maintenance factor of 10th cycle in the charging/discharging test of battery is 1/12C at 30 degrees C, of 85% or more.    USE - Alkali metal-sulfur-type secondary battery is used in electric vehicle, mobile telephone terminal and hybrid electric vehicle.    ADVANTAGE - The alkali metal-sulfur-type secondary battery has excellent durability and coulomb efficiency, and inhibits side reaction at the time of charging/discharging, and suppresses reduction of discharge capacity by repetition of charging/discharging.    DETAILED DESCRIPTION - An alkali metal-sulfur-type secondary battery comprises positive electrode or negative electrode comprising sulfur-type electrode active material containing elemental sulfur, metal sulfide, metal polysulfide, and/or organosulfur compound, electrolyte solution containing glyme excluding tetraglyme of formula (I), and alkali metal salt, and counter electrode of positive electrode or negative electrode comprising alkali metal, alloy containing alkali metal, or counter electrode comprising carbon. The molar ratio of alkali metal salt with respect to the glyme is 0.5-2, and portion(s) of glyme and the alkali metal salt forms complex. The discharge capacity maintenance factor of 10th cycle in the charging/discharging test of alkali metal-sulfur-type secondary battery under conditions of current density of 1/12C, charging/discharging voltage of 1.5-3.3 V and discharge condition of 1/12C at 30 degrees C, is 85% or more.    R=1-9C alkyl optionally substituted by fluoro, or phenyl or cyclohexyl (both optionally substituted by halo);and    x=1-6.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of alkali metal-sulfur-type secondary battery.    Positive electrode (2)    Negative electrode (4)    Gasket (10)    Coin cell case (20)    Alkali metal-sulfur-type secondary battery (50)