A portable printer and a member having a two-layer configuration formed from members having different mold shrinkage ratios and having a superior shock resistance without distortion may be achieved. The member (50) including an inner layer (52) formed from a first material and an outer layer (54) formed from a second material. The second material has a higher mold shrinkage ratio than the first material. A protrusion (52A) included on at least at one end of the inner layer (52), such that an end surface (54a) of the outer layer (54) is covered by the protrusion (52A).