This invention provides a wearable multifunctional sensor device, which is applicable to wear under a user’s nostrils and comprises a shell, a flexible circuit board, a gas sensor, and at least one of flow sensor. Said shell includes a near side standing wall facing the user, a upper wall extending from a top end of said near side standing wall rearward to the user and formed with a through hole, a distal side standing wall extending downwardly from a distal end of said upper wall that is away from the user, and a lower wall extending forward to the user from a lower end of said distal side standing wall and connecting to an lower end of said near side standing wall. Said flexible circuit board is located inside of said shell, and includes a device setting section disposed in said near side standing wall, and at least one of cantilever beam section extending forward to said distal side standing wall from an top end of said device setting section. Said cantilever beam section formed with an air intake corresponding to the through hole of said upper wall. Said gas sensor disposed in said device setting section. Said at least one of flow sensor disposed in said cantilever beam section, and includes a piezoelectric layer, a top electrode formed on an upper surface of said piezoelectric layer, a bottom electrode formed on a bottom surface of said piezoelectric layer, and an air intake hole penetrating said top electrode and said piezoelectric layer. |