PURPOSE: To improve the yield of ripe strawberry by providing sheet members having holes with specific intervals on at least one side of row of cultured strawberry having prescribed intervals.

CONSTITUTION: Seedlings 2 of strawberry are planted on row 1 on which a mulching film 5 and a net-like sheet 6 are laminated with intervals of 100-200mm and plural supports 3 are erected with intervals of 500-1000mm on at least one side of the culturing row of the strawberry, and a sheet material 4 having openings capable of preventing the passage of growing seedling 4 but permitting the passing through light and air are attached to the above-mentioned support 3 and fixed with a binding member 7 with intervals (≥100mm) from ground enough to permit the passage of bine when the seedlings 2 are grown and the seedlings 2 are cultured according to an ordinary method.