NOVELTY - The apparatus (100) has a guide roll (6) for guiding a sheet for application (S). A slit die (20) has an opening extending in an axial direction of the roll and applies a liquid to a surface of the sheet guided by the roll. The slit die has two flow paths spaced in a rotational direction of the roll and joins at an opening (24). Distance is formed between points at which the two flow paths join and the opening is 0.05 to 2.8 mm. Width of an upper layer flow path (23a) and width of a lower layer flow path (23b) is 3:2 to 3:1 in a cross section perpendicular to an axis (6a) of the roll.    USE - Liquid application apparatus for forming an active material containing layer of an electrochemical device such as lithium ion and secondary battery, and for forming a recording medium. Uses include but are not limited to liquid such as active material e.g. lithium containing metal oxide and carbon powder, conductive aid i.e. carbon black, binder i.e. Polyvinylidene fluoride (PVDF), solvent such as N-methylpyrrolidone (NMP), tetrahydrofuran (THF), and N,N-dimethylformamide (DMF).    ADVANTAGE - The liquid application apparatus suppresses undulation at an interface between an upper layer and a lower layer when liquids different from each other are fed into the two flow paths to form a laminate of two liquid layers on the surface of the sheet for application. The ratio of the width of the upper layer flow path and the width of the lower layer flow path is preferably 3:2 to 3:1 in the cross section perpendicular to the axis of the guide roll, thus suppressing the undulation at the interface easily when the lower layer is relatively thin.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a liquid application method.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of configuration of a liquid application apparatus.    Sheet (S)    Guide roll (6)    Guide roll axis (6a)    Slit die (20)    Upper layer flow path (23a)    Lower layer flow path (23b)    Opening (24)    Liquid application apparatus (100)