A
sandwich panel that has excellent practicality as an inner
wall material used in aircraft, for example, whereby the abovementioned requirements of
flexural strength, peel strength, and in-plane
shear strength can be satisfied while having reduced weight. A
sandwich panel in which a middle material 2 and a surface material 3 that are each formed by laminating a plurality of
fiber bodies are laminated from inside to outside on the upper and lower surfaces of a hollow columnar core 1, wherein the middle material 2 is composed of a set of unidirectional
fiber bodies 4, 5 whose fibers are aligned in one direction, bonding
layers 6, 7 having a resin content ratio of 50% or higher are provided between the unidirectional
fiber bodies 4, 5 and between the hollow columnar core 1 and an inside unidirectional fiber body 5, the bonding layer 7 is composed of a woven fiber body 7 in which fibers are used for a warp
yarn and a woof
yarn that is orthogonal to the warp
yarn, and the yarns are woven, and the woven fiber body 7 is formed so that any one of the warp yarn and the woof yarn is substantially parallel to the edge of the
sandwich panel, and the other of the warp yarn and the woof yarn is substantially orthogonal to the edge of the sandwich panel.