An air conditioning indoor unit comprising: a housing that is provided with an air inlet port through which indoor air can be sucked and an air outlet port through which the air can be blown outward; a heat exchange unit that is accommodated in the housing and is configured to perform heat exchange with the air sucked through the air inlet port; a cross flow fan that is accommodated in the housing, is disposed to extend in a width direction of the housing, and is provided with an outer circumferential surface, the outer circumferential surface including a first outer circumferential surface corresponding to an air inflow region into which the air after the heat exchange flows and a second outer circumferential surface corresponding to an air outflow region from which the air after the heat exchange flows out; a rear guider that is accommodated in the housing and is disposed close to a rear surface of the housing; a stabilizer that is accommodated in the housing, is disposed close to a front surface of the rear guider, and defines an air outlet flow path that communicates with the air outlet port and through which the air outflow region is exposed, the air outlet flow path being defined between the stabilizer and the rear guider; and an end portion casing (21, 22, 55) that is provided for an end portion of the cross flow fan and is provided with a first portion and a second portion, the first portion being provided with a first inner surface forming a first gap between the first inner surface and the first outer circumferential surface positioned at the end portion of the cross flow fan and the second portion being provided with a second inner surface (49a, 56a) forming a second gap (49G, 56G) between the second inner surface (49a, 56a) and the second outer circumferential surface positioned at the end portion of the cross flow fan, characterized in that the second gap (49G, 56G) is wider than the first gap; and the second inner surface (49a, 56a) is an inclined surface that is inclined in a direction away from a central axis of the cross flow fan. a housing that is provided with an air inlet port through which indoor air can be sucked and an air outlet port through which the air can be blown outward; a heat exchange unit that is accommodated in the housing and is configured to perform heat exchange with the air sucked through the air inlet port; a cross flow fan that is accommodated in the housing, is disposed to extend in a width direction of the housing, and is provided with an outer circumferential surface, the outer circumferential surface including a first outer circumferential surface corresponding to an air inflow region into which the air after the heat exchange flows and a second outer circumferential surface corresponding to an air outflow region from which the air after the heat exchange flows out; a rear guider that is accommodated in the housing and is disposed close to a rear surface of the housing; a stabilizer that is accommodated in the housing, is disposed close to a front surface of the rear guider, and defines an air outlet flow path that communicates with the air outlet port and through which the air outflow region is exposed, the air outlet flow path being defined between the stabilizer and the rear guider; and an end portion casing (21, 22, 55) that is provided for an end portion of the cross flow fan and is provided with a first portion and a second portion, the first portion being provided with a first inner surface forming a first gap between the first inner surface and the first outer circumferential surface positioned at the end portion of the cross flow fan and the second portion being provided with a second inner surface (49a, 56a) forming a second gap (49G, 56G) between the second inner surface (49a, 56a) and the second outer circumferential surface positioned at the end portion of the cross flow fan, characterized in that the second gap (49G, 56G) is wider than the first gap; and the second inner surface (49a, 56a) is an inclined surface that is inclined in a direction away from a central axis of the cross flow fan.