A portable and foldable support bracket for supporting and holding a portable electronic device includes a first support member, a pivot mechanism, a second support member and a support arm. The antenna is electrically connected to the ground plane and forms a current loop with the ground plane. 1 times larger than the content of the hydrophilic polymer in the proximate layer of the surface on the blood-contacting side, and the content of the hydrophilic polymer in the uppermost layer of the other surface of the polysulfone type hollow fiber membrane, i. Further, a piezoelectric element 33 that functions as vibration generating means is provided in the middle in the direction X of the exciting member 32A.