Device for applying a make-up product for keratinous fibers, in particular eyelashes, and a packaging and application unit using such a device

A device for applying a make-up product for eyelashes, comprising:

• a substantially flat handle;
• an applicator element having a free end and being mounted to a first end of said handle, said applicator element being formed by a blade defining a unitary structure elastically deformable in at least two orthogonal directions and disposed substantially parallel to a plane of the handle, wherein said blade has two main sides, wherein a width of said free end, measured along a first one of said orthogonal directions which is parallel to said plane, is at least equal to a quarter of an average width of an arc of the eyelashes to which the make-up product is to be applied;
• and
• reliefs formed on a surface of at least one of the main sides and being capable of retaining some of the product after a substantial portion of said surface has been brought into contact with the product.