To provide a holding device for electronic apparatus, capable of appropriately holding the electronic apparatus even when sizes of the electronic apparatuses are different and eliminating necessity of a gap for inserting fingers in a storage space of a holder so as to compactify the holder.

A holding device for electronic apparatus includes a holder for setting a predetermined electronic apparatus. The holder 10 includes a storage space 14 for an electronic apparatus (a smartphone 30). On both sides of the storage space facing each other, a rotating support 16 and a slide support 22 are disposed. Both the supports 16, 22 have receiving surfaces 18, 24 individually coming into contact with both end faces of the electronic apparatus. The rotating support 16 can perform rotating operation. The slide support 22 can perform straight movement and receives an energizing force of a support spring 26 in such a direction as to press the electronic apparatus against the rotating support side.