The present invention relates to an amorphous silica-based coating film with a low specific dielectric constant of 2. The internal boot includes a leg panel having an inflatable bladder and a pump panel having a pump for inflating the bladder. The terminal device includes an encrypted data reception section receiving the encrypted data on which the server implements a predetermined process and a decrypting section decrypting the encrypted data on which the predetermined process is implemented. At least one additive element is present at a level greater than its room-temperature solid solubility limit in the titanium-base alloy.