Inorganic fiber sheet

Provided is an inorganic fiber sheet which has high processability and the like, and which has excellent adhesiveness or adhesiveness even when coated with an adhesive or an adhesive. The inorganic fiber sheet is a nonwoven fabric containing inorganic fibers, the thickness T of the inorganic fiber sheet is 1 mm or more, the inorganic fiber sheet contains slag balls which are derived from the inorganic fibers and have a diameter of 45 [mu] m or more, and the slag balls contained in the inorganic fiber sheet are distributed in the sheet thickness direction in a manner represented by formula 1. Wherein formula 1 is represented by '1-Y/X < = 0.12', in the formula, X represents' the total weight of slag balls per unit area of the inorganic fiber sheet '/' the total weight of the inorganic fiber sheet per unit area ', and X represents the total weight of slag balls per unit area of the inorganic fiber sheet'. Y represents the weight per unit area of slag balls contained in the inorganic fiber sheet from which a por