This invention provides a hydrocarbon concentration measuring apparatus, which, even when the concentration and composition of hydrocarbons contained in an object gas to be measured vary, can measure the concentration of the hydrocarbons with good response and good accuracy, and a hydrocarbon measuring method. The digital memory is configured to store one set of digital calibration values for each of the current sources and to apply each stored set of digital calibration values to the corresponding current source to set the output current of the corresponding output current source. A plurality of column lines electrically connect the first region of cells in the same column. Each piezoelectric element expands and contracts when a voltage potential difference between the positive pole and the negative pole is varied. This invention is particularly suitable for architectural structures having windows that can be subjected to the extreme conditions prevalent in a hurricane, or window that can be placed under severe stress from repeated forceful blows to the laminate.