The present invention relates to an annealing separator for an oriented electrical steel sheet, an oriented electrical steel sheet, and a method for manufacturing an oriented electrical steel sheet. Specifically, the present invention can provide an annealing separator for an oriented electrical steel sheet, an oriented electrical steel sheet manufactured using the same, and a method for manufacturing an oriented electrical steel sheet, the annealing separator comprising: a first component including an Mg oxide or an Mg hydroxide; and a second component comprising one, or two or more, of oxides and hydroxides of a metal selected from Al, Ti, Cu, Cr, Ni, Ca, Zn, Na, K, Mo, In, Sb, Ba, Bi and Mn, wherein the annealing separator satisfies the following formula 1: [formula 1] 0.05 < [A]/[B] <10.5, where [A] is the content of the second component with respect to the total amount (100 wt%) of the annealing separator, and [B] is the content of the first component with respect to the total amount (100 wt%) of the annealing separator.