A fan unit comprising: a heat storage element in a cylindrical shape; a first holding member in a cylindrical shape, the first holding member being configured such that one side of the heat storage element is inserted into the first holding member; and a second holding member in a cylindrical shape, the second holding member being configured such that another side of the heat storage element is inserted into the second holding member, wherein the first holding member includes a guard part, having a space through which air flows, at one end of the first holding member, and the first holding member is configured such that the heat storage element is inserted into the first holding member from a side opposite to the side having the guard part, and that a fan is installable between the guard part and the heat storage element, and the first holding member and the second holding member are coupled by a given coupling means in a state where the heat storage element is interposed between the first holding member and the second holding member, and wherein an inner peripheral face of the first holding member has a first lock part that locks the coupling means, and an inner peripheral face of the second holding member has a second lock part that locks the coupling means, characterized in that a space is formed between the inner peripheral face of the first holding member and a blade of the fan because the first lock part is formed on the inner peripheral face of the first holding member, and the fan unit further comprises a cylindrical filling member to be embedded in the first holding member so that the space between the inner peripheral face of the first holding member and the blade of the fan is filled with the filling member. a heat storage element in a cylindrical shape; a first holding member in a cylindrical shape, the first holding member being configured such that one side of the heat storage element is inserted into the first holding member; and a second holding member in a cylindrical shape, the second holding member being configured such that another side of the heat storage element is inserted into the second holding member, wherein the first holding member includes a guard part, having a space through which air flows, at one end of the first holding member, and the first holding member is configured such that the heat storage element is inserted into the first holding member from a side opposite to the side having the guard part, and that a fan is installable between the guard part and the heat storage element, and the first holding member and the second holding member are coupled by a given coupling means in a state where the heat storage element is interposed between the first holding member and the second holding member, and wherein an inner peripheral face of the first holding member has a first lock part that locks the coupling means, and an inner peripheral face of the second holding member has a second lock part that locks the coupling means, characterized in that a space is formed between the inner peripheral face of the first holding member and a blade of the fan because the first lock part is formed on the inner peripheral face of the first holding member, and the fan unit further comprises a cylindrical filling member to be embedded in the first holding member so that the space between the inner peripheral face of the first holding member and the blade of the fan is filled with the filling member.