Disclosed is a portable device for measuring temperature with infrared array sensor. This portable device includes: an infrared array sensor module for taking temperature values in a unit of pixel and including a plurality of infrared sensors arranged in an array of pixels a controller for calculating a resultant temperature value of a subject with reference to the temperature values taken each by the sensors a display for expressing the resultant temperature value calculated by the controller and a view finder with an indicator defining a target point to be measured for temperature and having a profile corresponding to the whole or a local shape of the subject. The view finder is formed of a transparent plate on which the subjects shape is reflected. The transparent plate is formed of: a notch representing the indicator and a lens at least provided in the indicator.
