The present invention relates to an optical-illusion theater that can make a small display device (particularly, for example, a mobile phone screen) appear larger like a virtual movie theater. The main feature of the present invention comprises: a mobile-phone receiving part (10) having a mobile phone therein; a body (20) integrally connected with the mobile-phone receiving part (10); and a viewing part (30) connected with the body (20), wherein a user's head is capable of being placed in the viewing part (30). The body (20) is configured to be a darkroom having seats (25) therein and is configured to exhibit an optical-illusion effect such that the body (20) appears to be a movie theater. The body (20) is made smaller in volume than the viewing part (30) so that the body (20) can be inserted into the viewing part (30). A lens (44) is disposed between the body (20) and the viewing part (30) so that the user can view a magnified screen. A connecting piece (40) having a lens window (43) equipped with the lens (44) is disposed between the body (20) and the viewing part (30) in which the user's head can be placed, the viewing part (30) being connected with the body (20). The body (20) can be coupled with the viewing part (30) by an insertion piece (24) protruding from the body (20).
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