A low yield ratio high-strength hot-dip galvanized steel sheet includes as chemical composition, by % by mass, 0.03% to 0.20% C, 1.0% or less Si, more than 1.5% to 3.0% Mn, 0.10% or less P, 0.05% or less S, 0.10% or less Al, 0.010% or less N, 0.5% or less Cr, and 0.01% to 0.50% Mo, and the balance Fe with inevitable impurities, and also includes a structure including a ferrite and a second phase. The ferrite has an area ratio of 50% or more, and the second phase includes martensite whose area ratio is in the range from 7% to less than 25%. The thickness of a band-like structure formed by the second phase satisfies the predetermined equation.
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