A washing machine comprising: a cabinet configured to include an opening for loading and retrieving laundry at one side surface of the cabinet; a tub (20, 70) configured to include an opening part corresponding to an opening of the cabinet at a front surface of the tub (20, 70), and disposed inside the cabinet; a drum configured to include an opening part corresponding to an opening part of the tub (20, 70) at a front surface of the drum, and rotatably installed inside the tub (20, 70); and a laundry-escape prevention unit configured to prevent the laundry from escaping from an inside of the drum, and coupled to the tub (20, 70), wherein the laundry-escape prevention unit includes a guide member configured to include one side coupled to a front surface portion of the tub (20, 70) and the other side having a shape protruding toward a center of the opening of the cabinet, wherein the guide member includes: a first guide (111, 131) configured to extend from the tub (20, 70) toward the center of the opening; and a second guide (112, 132) configured to extend from one side of the first guide (111, 131) in an inward direction of the drum, characterized in that the first guide (111, 131) includes an upper surface (113, 133) facing the center of the opening, a first inclined surface (114, 134) forming a first incline angle (θ1) with the upper surface (113, 133) and extending from one side of the upper surface (113, 133) when viewed from the center of the opening, and a second inclined surface (115, 135) forming a second incline angle (θ2) with the upper surface (113, 133) and extending from the other side of the upper surface (113, 133) when viewed from the center of the opening, and the first incline angle (θ1) is provided as greater than the second incline angle (θ2). a cabinet configured to include an opening for loading and retrieving laundry at one side surface of the cabinet; a tub (20, 70) configured to include an opening part corresponding to an opening of the cabinet at a front surface of the tub (20, 70), and disposed inside the cabinet; a drum configured to include an opening part corresponding to an opening part of the tub (20, 70) at a front surface of the drum, and rotatably installed inside the tub (20, 70); and a laundry-escape prevention unit configured to prevent the laundry from escaping from an inside of the drum, and coupled to the tub (20, 70), wherein the laundry-escape prevention unit includes a guide member configured to include one side coupled to a front surface portion of the tub (20, 70) and the other side having a shape protruding toward a center of the opening of the cabinet, wherein the guide member includes: a first guide (111, 131) configured to extend from the tub (20, 70) toward the center of the opening; and a second guide (112, 132) configured to extend from one side of the first guide (111, 131) in an inward direction of the drum, a first guide (111, 131) configured to extend from the tub (20, 70) toward the center of the opening; and a second guide (112, 132) configured to extend from one side of the first guide (111, 131) in an inward direction of the drum, characterized in that the first guide (111, 131) includes an upper surface (113, 133) facing the center of the opening, a first inclined surface (114, 134) forming a first incline angle (θ1) with the upper surface (113, 133) and extending from one side of the upper surface (113, 133) when viewed from the center of the opening, and a second inclined surface (115, 135) forming a second incline angle (θ2) with the upper surface (113, 133) and extending from the other side of the upper surface (113, 133) when viewed from the center of the opening, and the first incline angle (θ1) is provided as greater than the second incline angle (θ2).