Provided are an all-solid-state lithium ion secondary battery including, in the following order, a positive electrode layer, a solid electrolyte layer, and a negative electrode layer, in which the solid electrolyte layer contains an amorphous solid electrolyte which contains a lithium-containing oxide containing Li, B, and O and a lithium salt, in the amorphous solid electrolyte, a value of a ratio of a content of the lithium salt to a content of the lithium-containing oxide is 0.001 to 1.5 in terms of a molar ratio, and moisture contained in a laminate consisting of a positive electrode active material layer, the solid electrolyte layer, and a negative electrode active material layer is in a specific state; and a manufacturing method of the all-solid-state lithium ion secondary battery.