NOVELTY - Preparing all-solid battery (1) involves forming first electrolyte layer by relatively moving second nozzle which discharges first electrolyte material with respect to current collector to apply first electrolyte material to each of linear active material parts to prepare linear active material-electrolyte parts, photo-curing by irradiating light to linear electrolyte parts to cure and forming second electrolyte layer by applying second electrolyte material to whole of linear active material-electrolyte part and spaces on current collector between linear active material-electrolyte parts.    USE - For preparing an all-solid battery (claimed), particularly lithium ion secondary battery, used in mobile devices e.g. laptop computer and cellular phone and automobiles.    ADVANTAGE - The solid electrolyte layer has high aspect ratio, and gives all-solid lithium ion secondary battery excellent in large capacity and high charge-discharge performance.    DETAILED DESCRIPTION - Preparing an all-solid battery (1) involves forming a linear active material part by relatively moving a first nozzle which discharges active material linearly with respect to a current collector to form linear active material parts on current collector, forming first electrolyte layer by relatively moving a second nozzle which discharges a first electrolyte material with respect to current collector to apply first electrolyte material to each of the linear active material parts to from linear electrolyte part on it to prepare linear active material-electrolyte parts, photo-curing by irradiating light to linear electrolyte parts to cure, and forming second electrolyte layer by applying a second electrolyte material to whole of the linear active material-electrolyte part and spaces on current collector between the linear active material-electrolyte parts to prepare a second electrolyte layer.    DESCRIPTION OF DRAWING(S) - The figure shows schematic vertical sectional view of lithium ion secondary battery.    Lithium ion secondary battery (1)    Negative electrode current collector (10)    Negative electrode active material layer (12)    Active material-electrolyte part (13)    Solid electrolyte layer (14)    Positive electrode active material layer (16)    Positive electrode current collector (18)