An applicator for infusion devices comprising: - a main body comprising an access opening and an upper opening coaxial with each other and defined respectively in a lower portion and an upper portion of the main body; - a central body positioned inside said main body and comprising a seat for containing said infusion device, said seat facing towards said access opening for housing said infusion device; - a dragging element comprising a first portion, wherein a first end is connected or connectable to said central body and passes through said upper opening, and a second portion, which can be pressed by a user, located at a second end of said first portion, - actuating means connected or connectable to said central body; said central body being movable inside said main body between a first configuration, wherein said central body is positioned in said lower portion of the main body and said first portion of the dragging element is positioned inside the main body, and a second configuration wherein said central body is positioned in said upper portion of the main body and said first portion of the dragging element is positioned outside the main body; said central body being movable by pressure by the user from the first configuration to the second and said actuating means can be operated by the user for moving said central body from the second to the first configuration for applying, in use, the infusion device, housed in the containment seat of the central body, to the skin of a user; characterised in that said second portion can be pressed, when said central body is in said first configuration following the application of said infusion device, in such a way as to further move said central body towards said access opening to promote a homogeneous adhesion of the infusion device to the skin. - a main body comprising an access opening and an upper opening coaxial with each other and defined respectively in a lower portion and an upper portion of the main body; - a central body positioned inside said main body and comprising a seat for containing said infusion device, said seat facing towards said access opening for housing said infusion device; - a dragging element comprising a first portion, wherein a first end is connected or connectable to said central body and passes through said upper opening, and a second portion, which can be pressed by a user, located at a second end of said first portion, - actuating means connected or connectable to said central body; said central body being movable inside said main body between a first configuration, wherein said central body is positioned in said lower portion of the main body and said first portion of the dragging element is positioned inside the main body, and a second configuration wherein said central body is positioned in said upper portion of the main body and said first portion of the dragging element is positioned outside the main body; said central body being movable by pressure by the user from the first configuration to the second and said actuating means can be operated by the user for moving said central body from the second to the first configuration for applying, in use, the infusion device, housed in the containment seat of the central body, to the skin of a user; characterised in that said second portion can be pressed, when said central body is in said first configuration following the application of said infusion device, in such a way as to further move said central body towards said access opening to promote a homogeneous adhesion of the infusion device to the skin.