An indoor unit of an air-conditioning apparatus, comprising: a body casing for receiving an indoor air-sending device configured to take in air and an indoor heat exchanger configured to exchange heat between refrigerant and the air taken in by the indoor air-sending device ; and an outer shell panel (6, SP1, SP2) attached to the body casing , the outer shell panel (6, SP1, SP2) including: a front panel provided on a front surface portion of the body casing ; and side panels (SP1, SP2) provided on side surface portions of the body casing , the side panels (SP1, SP2) each including: a base member provided on a side end portion of the front panel ; a connecting member having a flat plate shape and has no light transmissivity, the connecting member including a first surface (S1) and a second surface (S2) formed on a side opposite to the first surface (S1), and being attached to the base member , the first surface (S1) located to face the base member ; a design panel having a flat plate shape and light transmissivity, the design panel being attached to a peripheral edge of the connecting member to be opposite to the second surface (S2) of the connecting member , and a band-shaped panel attached to the design panel to be stacked on the design panel , characterized in that the design panel including: a first surface portion , a second surface portion , and a connecting portion connecting the first surface portion and the second surface portion , the band-shaped panel being fixed to the connecting portion , and formed to extend from a front end of the design panel to a rear end thereof. a body casing for receiving an indoor air-sending device configured to take in air and an indoor heat exchanger configured to exchange heat between refrigerant and the air taken in by the indoor air-sending device ; and an outer shell panel (6, SP1, SP2) attached to the body casing , the outer shell panel (6, SP1, SP2) including: a front panel provided on a front surface portion of the body casing ; and side panels (SP1, SP2) provided on side surface portions of the body casing , a front panel provided on a front surface portion of the body casing ; and side panels (SP1, SP2) provided on side surface portions of the body casing , the side panels (SP1, SP2) each including: a base member provided on a side end portion of the front panel ; a connecting member having a flat plate shape and has no light transmissivity, the connecting member including a first surface (S1) and a second surface (S2) formed on a side opposite to the first surface (S1), and being attached to the base member , the first surface (S1) located to face the base member ; a design panel having a flat plate shape and light transmissivity, the design panel being attached to a peripheral edge of the connecting member to be opposite to the second surface (S2) of the connecting member , and a band-shaped panel attached to the design panel to be stacked on the design panel , a base member provided on a side end portion of the front panel ; a connecting member having a flat plate shape and has no light transmissivity, the connecting member including a first surface (S1) and a second surface (S2) formed on a side opposite to the first surface (S1), and being attached to the base member , the first surface (S1) located to face the base member ; a design panel having a flat plate shape and light transmissivity, the design panel being attached to a peripheral edge of the connecting member to be opposite to the second surface (S2) of the connecting member , and a band-shaped panel attached to the design panel to be stacked on the design panel , a first surface portion , a second surface portion , and a connecting portion connecting the first surface portion and the second surface portion , the band-shaped panel being fixed to the connecting portion , and formed to extend from a front end of the design panel to a rear end thereof. <EOS>