Abstract: A portable door alarm having an alarm pushbutton switch extending from the back of the housing of the alarm has a first L-shaped member hingeably attached to a bottom portion of the housing. At the top of the first L-shaped member is a bracket hanger which fits over the top of a door. The first L-shaped member is biased to close the hinge, thereby placing the first L-shaped member in close proximity to the housing. A leg portion of a second L-shaped member, having a longitudinal portion attached to the back of the housing, is located above the hanger and pushes against a wall portion above the door once the device is placed on the door and the door is closed. If the door is reopened, with the alarm set, an engaging portion of the first L-shaped member presses the alarm pushbutton switch as the L-shaped member returns to its close proximity to the back of the housing due to the biasing thereof. An alarm sounds once the engaging portion depresses the alarm pushbutton switch with the alarm set.