PURPOSE: To place asphalt or the like in an extensive area at a time with a placing apparatus set up with a lot of small buckets flatwise at the time of placing the asphalt or the like in order to build up a rubble-mound foundation, etc., being constructed on the seabed.

CONSTITUTION: A placing apparatus 20 being hung down by a crane in a work barge or the like is provided with such one that leg members 22 are set up in a corner part of each frame 21 and a lot of buckets 24 are connected crosswise. Each bucket 24 is one that installs a closing cover 25 closably, and each closing cover 25 installed in these buckets is opened at a time in a state of being interlocked, through which the asphalt or the like is made so as to be executable at once in a wide areal part of an upper part or the like of a rubble- mound foundation 1.