To provide an indoor clotheshorse device in which a clotheshorse arm can be easily attached, and which can be manufactured at a reduced cost.

The present invention relates to an indoor clotheshorse device 1 including a mounting base 4 capable of being mounted to an indoor wall surface or an indoor side surface of a window frame 2 and a clotheshorse arm 5 capable of being detachably attached to the mounting base 4 in a cantilever manner. The mounting base 4 has a first engaged part 6 and a second engaged part 7 positioned below the first engaged part 6. The clotheshorse arm 5 has, in the base end part thereof, a first engaging part 15 engaging with the first engaged part 6 and a second engaging part 16 engaging with the second engaged part 7. The second engaging part 16 is constituted by a spring member whose tip abutting the mounting base 4 is elastically deformed downward to engage with the second engaged part 7, by swinging the clotheshorse arm 5 downward while allowing the first engaging part 15 to engage with the first engaged part 6.