An adhesive composition, comprising: a polyisocyanate component; and a polyol component, wherein the polyisocyanate component satisfies all of the following (i) to (iv), (i) the polyisocyanate component contains the following component and a crude MDI, (ii) the component is consisting essentially of a urethane prepolymer obtained by allowing a polyol consisting essentially of a polyether polyol and an isocyanate component to react under the condition of excess isocyanate groups with respect to a hydroxyl group in a polyol and may contain an unreacted isocyanate component, (iii) the isocyanate component is consisting essentially of - 4,4'-diphenylmethane diisocyanate, or - 4,4'-diphenylmethane diisocyanate and at least one type of isocyanate selected from the group consisting of 2,4'-diphenylmethane diisocyanate and tolylene diisocyanate, and (iv) the crude MDI contains at least one type of MDI monomer selected from the group consisting of 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, and 2,2'-diphenylmethane diisocyanate and polymethylene polyphenylene isocyanate, and the content by percentage of the isocyanate group is less than 33 mass%, and the polyol component is a polyol composition that is consisting essentially of a polyester diol having a number-average molecular weight of no less than 500 nor more than 3,000, and at least one type selected from the group consisting of a diol having a number-average molecular weight of no less than 50 and less than 400, a triol having a number-average molecular weight of no less than 50 and less than 500, and a polyether diol having a number-average molecular weight of no less than 400 and less than 1000. a polyisocyanate component; and a polyol component, wherein the polyisocyanate component satisfies all of the following (i) to (iv), (i) the polyisocyanate component contains the following component and a crude MDI, (ii) the component is consisting essentially of a urethane prepolymer obtained by allowing a polyol consisting essentially of a polyether polyol and an isocyanate component to react under the condition of excess isocyanate groups with respect to a hydroxyl group in a polyol and may contain an unreacted isocyanate component, (iii) the isocyanate component is consisting essentially of - 4,4'-diphenylmethane diisocyanate, or - 4,4'-diphenylmethane diisocyanate and at least one type of isocyanate selected from the group consisting of 2,4'-diphenylmethane diisocyanate and tolylene diisocyanate, and (iv) the crude MDI contains at least one type of MDI monomer selected from the group consisting of 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, and 2,2'-diphenylmethane diisocyanate and polymethylene polyphenylene isocyanate, and the content by percentage of the isocyanate group is less than 33 mass%, and (i) the polyisocyanate component contains the following component and a crude MDI, (ii) the component is consisting essentially of a urethane prepolymer obtained by allowing a polyol consisting essentially of a polyether polyol and an isocyanate component to react under the condition of excess isocyanate groups with respect to a hydroxyl group in a polyol and may contain an unreacted isocyanate component, (iii) the isocyanate component is consisting essentially of - 4,4'-diphenylmethane diisocyanate, or - 4,4'-diphenylmethane diisocyanate and at least one type of isocyanate selected from the group consisting of 2,4'-diphenylmethane diisocyanate and tolylene diisocyanate, and - 4,4'-diphenylmethane diisocyanate, or - 4,4'-diphenylmethane diisocyanate and at least one type of isocyanate selected from the group consisting of 2,4'-diphenylmethane diisocyanate and tolylene diisocyanate, and (iv) the crude MDI contains at least one type of MDI monomer selected from the group consisting of 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, and 2,2'-diphenylmethane diisocyanate and polymethylene polyphenylene isocyanate, and the content by percentage of the isocyanate group is less than 33 mass%, and the polyol component is a polyol composition that is consisting essentially of a polyester diol having a number-average molecular weight of no less than 500 nor more than 3,000, and at least one type selected from the group consisting of a diol having a number-average molecular weight of no less than 50 and less than 400, a triol having a number-average molecular weight of no less than 50 and less than 500, and a polyether diol having a number-average molecular weight of no less than 400 and less than 1000.